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Least squares - Wikipedi

The prevailing methods seem to be the least-squares and geometric growth rates. Kakwani [4] states that the least-squared method is the most commonly used average growth rate method. However, sometimes it is reasonable to differentiate the use of growth rate methods based on the underlying variable in question In Exercises 1-4, find a least-squares solution of Ax = b by (a) constructing the normal equations for and (b) solving for Step-by-step solution: 100 %( 38 ratings The Least Squares Method is probably one of the most popular predictive analysis techniques in statistics. It is widely used to fit a function to a data set. The simplest example is defining a straight-line, as we looked above, but this function can be a curve or even a hyper-surface in multivariate statistical analysis

Least Squares Regression - How to Create Line of Best Fit

  1. ed mathematically through a series of computations
  2. The second method however is from Harmon et al. where you use the same equation but graph it as follows The single negative exponential model can be fit to the data by least-squares linear.
  3. There is an equivalent under-identified estimator for the case where m < k.Since the parameters are the solutions to a set of linear equations, an under-identified model using the set of equations ′ = does not have a unique solution.. Interpretation as two-stage least squares. One computational method which can be used to calculate IV estimates is two-stage least squares (2SLS or TSLS)

Least square means are means for groups that are adjusted for means of other factors in the model. Imagine a case where you are measuring the height of 7th-grade students in two classrooms, and want to see if there is a difference between the two classrooms p + 1 coefficients. The most commonly used method for finding a model is that of least squares estimation. Itissupposedthat x isan independent (orpredictor)variablewhichisknownexactly, while y is a dependent (or response) variable. The least squares (LS) estimates for β 0 and β 1 ar

Now let's look at an example and see how you can use the least-squares regression method to compute the line of best fit. Least Squares Regression Example. Consider an example. Tom who is the owner of a retail shop, found the price of different T-shirts vs the number of T-shirts sold at his shop over a period of one week The process of using the least squares regression equation to estimate the value of y at a value of x that does not lie in the range of the x -values in the data set that was used to form the regression line is called extrapolation. It is an invalid use of the regression equation that can lead to errors, hence should be avoided

Least Squares Regression - MAT

  1. compute f(x i), g(x i), etc. store in column i of A store y i in b compute ATA, ATb • Linear least squares is not always the most • Dealing with outliers and bad data • Practical considerations - Is least squares an appropriate method for my data? • Examples with Excel and Matlab . Title: cos323_f11_lecture07_lsq.pptx.
  2. least squares solution. Our goal in this section is to computebx and use it. These are real problems and they need an answer. The previous section emphasized p (the projection). This section emphasizes bx (the least squares solution). They are connected by p DAbx. The fundamental equation is still A TAbx DA b. Here is a short unofficial way to.
  3. Least-squares regression is a statistical technique that may be used to estimate a linear total cost function for a mixed cost, based on past cost data.The cost function may then be used to predict the total cost at a given level of activity such as number of units produced or labor/machine hours used
  4. WLS, OLS' Neglected Cousin. At Metis, one of the first machine learning models I teach is the Plain Jane Ordinary Least Squares (OLS) model that most everyone learns in high school. Excel has a way of removing the charm from OLS modeling; students often assume there's a scatterplot, some magic math that draws a best fit line, then an r² in the corner that we'd like to get close to 1

Least Squares Calculator. Least Squares Regression is a way of finding a straight line that best fits the data, called the Line of Best Fit.. Enter your data as (x, y) pairs, and find the equation of a line that best fits the data We will now extend the method of least squares to equations with multiple independent variables of the form. As in Method of Least Squares, we express this line in the form. and so any row which contains non-numeric data for either column in the pair is not used to calculate that coefficient value An example of how to calculate linear regression line using least squares. A step by step tutorial showing how to develop a linear regression equation. Use.. The LINEST function calculates the statistics for a line by using the least squares method to calculate a straight line that best fits your data, and then returns an array that describes the line. You can also combine LINEST with other functions to calculate the statistics for other types of models that are linear in the unknown parameters.

Table 2 shows the calculation of least squares means. First step is to calculate the means for each cell of treatment and center combination. The mean 9/3=3 for treatment A and center 1 combination; 7.5 for treatment A and center 2 combination; 5.5 for treatment B and center 1 combination; and 5 for treatment B and center 2 combination Least Squares method. Now that we have determined the loss function, the only thing left to do is minimize it. This is done by finding the partial derivative of L, equating it to 0 and then finding an expression for m and c. After we do the math, we are left with these equations Approximating a dataset using a polynomial equation is useful when conducting engineering calculations as it allows results to be quickly updated when inputs change without the need for manual lookup of the dataset. The most common method to generate a polynomial equation from a given data set is the least squares method. This article demonstrates how to generate a polynomial curve fit using. [Applied Maths - Sem 4 ]PLAYLIST : https://www.youtube.com/playlist?list=PL5fCG6TOVhr7oPO0vildu0g2VMbW0uddVUnit 1PDE - Formation by Eliminating Aribtrary Co..

Method of Least Squares Real Statistics Using Exce

The least squares method is a form of mathematical regression analysis used to determine the line of best fit for a set of data, providing a visual demonstration of the relationship between the. If instead we used Eabs(a;b) = XN n=1 jyn ¡(axn +b)j; (3.21) then numerical techniques yield that the best fit value of a is 5:03 and the best fit value of b is less than 10¡10 in absolute value. The difference between these values and those from the Method of Least Squares is in the best fit value of b(the least important of the two. A least squares method of the kind shown above is a very powerful alternative procedure for obtaining integral forms from which an approximate solution can be started, and has been used with considerable success [15-18].As a least squares variational principle can be written for any set of differential equations without introducing additional variables, we may well inquire as to what the. The method should not be used for a load of 50kg because 50kg is much bigger than anything in Table 1 (and regression predictions are only valid for values of X that are within the same general range as the values of X used to compute the regression equation) Least squares fitting has the desirable property that if you have two different output values for the same input value, and you replace them with two copies of their mean, the least squares fit is unaffected. For example, the best fit line is the same for the following two sets of data: 0 1 0 5 1 5 2 6 and. 0 3 0 3 1 5 2

The Least Squares Regression Method - How to Find the Line

Maths reminder Find a local minimum - gradient algorithm When f : Rn −→R is differentiable, a vector xˆ satisfying ∇f(xˆ) = 0 and ∀x ∈Rn,f(xˆ) ≤f(x) can be found by the descent algorithm : given x 0, for each k : 1 select a direction d k such that ∇f(x k)>d k <0 2 select a step ρ k, such that x k+1 = x k + ρ kd k, satisfies (among other conditions Quadratic Least Square Regression A nonlinear model is any model of the basic form in which the functional part of the model is not linear with respect to the unknown parameters, and the method of least squares is used to estimate the values of the unknown parameters.

PPT - Regression Models & Loss Reserve Variability

Which of the following is not true of the method of least squares? a. The method uses only variable cost to calculate the total cost. b. The method uses only two points to develop the cost function. c. The method involves minimization of the squared differences between actual observations and the line (cost function). d but note that the discussion of pro's and con's of least squares regression and the alternative is both outdated and not all that comprehensive. That is to say, don't use it as a guide for. A diagram of the measurement method is shown below. The diagram shows the trace and Y, the distance from the spindle center to the trace at the angle. A least squares circle fit to data at equally spaced angles gives estimates of P - R, the noncircularity, where R = radius of the circle and P = distance from the center of the circle to the trace

Line of Best Fit (Least Square Method) - Varsity Tutor

This post is about the ordinary least square method (OLS) for simple linear regression. If you are new to linear regression, read this article for getting a clear idea about the implementation o Type of linear solver used to compute the solution to the linear least squares problem in each iteration of the Levenberg-Marquardt algorithm. If Ceres is built with support for SuiteSparse or CXSparse or Eigen 's sparse Cholesky factorization, the default is SPARSE_NORMAL_CHOLESKY , it is DENSE_QR otherwise The line that minimizes this least squares criterion is represented as the solid line in Figure \(\PageIndex{1}\). This is commonly called the least squares line. The following are three possible reasons to choose Criterion \ref{7.10} over Criterion \ref{7.9}: It is the most commonly used method The slope β ^ 1 of the least squares regression line estimates the size and direction of the mean change in the dependent variable y when the independent variable x is increased by one unit. The sum of the squared errors S S E of the least squares regression line can be computed using a formula, without having to compute all the individual errors

Least squares estimation method and maximum likelihood

Although the least-squares fitting method does not assume normally distributed errors when calculating parameter estimates, the method works best for data that does not contain a large number of random errors with extreme values. The normal distribution is one of the probability distributions in which extreme random errors are uncommon The method is called the method of least squares, for obvious reasons! The Equation for the Least-Squares Regression line. The equation of the least-squares is given by. where. Select Calculate; The fourth line shows the equation of the regression line. Note that it will not have x and y shown, but rather the names that you've given for x. Weighted Least Squares as a Transformation The residual sum of squares for the transformed model is S1( 0; 1) = Xn i=1 (y0 i 1 0x 0 i) 2 = Xn i=1 yi xi 1 0 1 xi!2 = Xn i=1 1 x2 i! (yi 0 1xi) 2 This is the weighted residual sum of squares with wi= 1=x2 i. Hence the weighted least squares solution is the same as the regular least squares solution.

For that I decided to use the least square method. The equation is presented below: The equation presents a connection between stress and time to failure of a tested product at different temperature levels. The data that I've used is made up, but presents the structure of the actual data, that I will use later on Least Squares Fit (1) The least squares fit is obtained by choosing the α and β so that Xm i=1 r2 i is a minimum. Let ρ = r 2 2 to simplify the notation. Find α and β by minimizing ρ = ρ(α,β). The minimum requires ∂ρ ∂α ˛ ˛ ˛ ˛ β=constant =0 and ∂ρ ∂β ˛ ˛ ˛ ˛ α=constant =0 NMM: Least Squares Curve-Fitting page Least Squares Method & Matrix Multiplication. One method of approaching linear analysis is the Least Squares Method, which minimizes the sum of the squared residuals. Residuals are the differences between the model fitted value and an observed value, or the predicted and actual values Least Square is the method for finding the best fit of a set of data points. It minimizes the sum of the residuals of points from the plotted curve. It gives the trend line of best fit to a time series data. This method is most widely used in time series analysis. Let us discuss the Method of Least Squares in detail

Solved: Compute the least-squares error associated with

the sum of squares (3.6) that makes no use of first and second order derivatives is given in Exercise 3.3. Summary of computations The least squares estimates can be computed as follows. Least squares estimation Step 1: Choice of variables. Choose the variable to be explained (y) and the explanatory variables (x 1, , x k, where x 1 is often. SVD and Least Squares • Solving Ax=b by least squares: • ATAx = ATb x = (ATA)-1ATb • Replace with A+: x = A+b • Compute pseudoinverse using SVD - Lets you see if data is singular (< n nonzero singular values) - Even if not singular, condition number tells you how stable the solution will be - Set 1/w i to 0 if Ramsey, J. B. (1969). Tests for specification errors in classical linear least-squares regression analysis. Journal of the Royal Statistical Society, 31(2), 350-371. Scott, A. J., & Holt, D. (1982). The effect of two-stage sampling on ordinary least squares methods. Journal of the American Statistical Association, 77(380), 848-854. Related Pages This might give numerical accuracy issues. Another way to find the optimal values for $\beta$ in this situation is to use a gradient descent type of method. The function that we want to optimize is unbounded and convex so we would also use a gradient method in practice if need be

Least Squares Method For Variable And Fixed Costs

In other words, least squares is a technique which is used to calculate a regression line (best fitting straight line with the given points) with the smallest value of the sum of residual squares. A linear fit matches the pattern of a set of paired data as closely as possible. LSRL method is the best way to find the 'Line of Best Fit' How to Calculate R-Squared. The formula for calculating R-squared is: Where: SS regression is the sum of squares due to regression (explained sum of squares) SS total is the total sum of squares . Although the names sum of squares due to regression and total sum of squares may seem confusing, the meanings of the variables are. Simplex method: the Nelder-Mead¶. The Nelder-Mead algorithms is a generalization of dichotomy approaches to high-dimensional spaces. The algorithm works by refining a simplex, the generalization of intervals and triangles to high-dimensional spaces, to bracket the minimum.. Strong points: it is robust to noise, as it does not rely on computing gradients

Least Squares Method (Linear Regression) - Accountingvers

  1. Linear Regression Introduction. A data model explicitly describes a relationship between predictor and response variables. Linear regression fits a data model that is linear in the model coefficients. The most common type of linear regression is a least-squares fit, which can fit both lines and polynomials, among other linear models
  2. data (i.e. least squares). Although this method can be surprisingly accurate, calculating a regression by hand or using computer program is obviously more precise. In addition, hand calculations and computer programs can provide confidence intervals
  3. imizing the in-sample mean squared error: MSE\(b 0;b 1) 1 n Xn i=1 (y i (b 0 + b 1x i)) 2 (1) In particular, we obtained the following results
  4. Algorithms for least-squares problems are also distinctive. This is a conse-quence of the special structure of the Hessian matrix for the least-squares objective function. The Hessian in this case is the sum of two terms. The first only involves the gradients of the functions {f i} and so is easier to compute. The second in
  5. A simple tutorial on how to calculate residuals in regression analysis. Simple linear regression is a statistical method you can use to understand the relationship between two variables, x and y.. One variable, x, is known as the predictor variable. The other variable, y, is known as the response variable. For example, suppose we have the following dataset with the weight and height of seven.

Ordinary Least Squares Regression. BIBLIOGRAPHY. Ordinary least squares (OLS) regression is a statistical method of analysis that estimates the relationship between one or more independent variables and a dependent variable; the method estimates the relationship by minimizing the sum of the squares in the difference between the observed and predicted values of the dependent variable configured. 3.2.6.1 Example: Method 6: Least Squares Regression. Linear Regression, or Least Squares Regression (LSR), is the most popular method for identifying a linear trend in historical sales data. The method calculates the values for a and b to be used in the formula: Y = a + b Calibration Methods 9/12/13 page 3 shown below. The x-intercept of the linear least-squares fit to the data is the negative of the concentration of the analyte in the diluted unknown. The x-intercept can be calculated from the equation for the linear least-squares fit (y = mx + b) for y = 0. Figure 3.1 Standard addition calibration curve In order to see how this result is obtained, recall that. The least squares method (non-linear model) can be used to estimate the parameters, α and k, of any of the S-R models. The initial values of the Beverton and Holt model (1957) can be obtained by re-writing the equation as: and estimating the simple linear regression between y (= S/R) and x (=S) which will give the estimations of 1/α and 1/(αk)

138 questions with answers in LEAST-SQUARES ANALYSIS

  1. Use least-squares regression to fit a straight line to x 1 3 5 7 10 12 13 16 18 20 y 4 5 6 5 8 7 6 9 12 11 a 7.3 - 0.3725 *10.5 3.3888 0.3725 10 *1477 105 10 *906 105 *73 n x ( x ) n (x y ) x y a 0 2 i 2 i i i i i 1 ¦ ¦ ¦ ¦ ¦ Exercise 24: It is always a good idea to plot the data points and the regression line to see how well the line.
  2. e the weights again and use the new weights in a second WLS regression
  3. Ordinary Least Squares (OLS) linear regression is a statistical technique used for the analysis and modelling of linear relationships between a response variable and one or more predictor variables. If the relationship between two variables appears to be linear, then a straight line can be fit to the data in order to model the relationship
  4. imising the sum of the squared errors
  5. Linear regression (or linear model) is used to predict a quantitative outcome variable (y) on the basis of one or multiple predictor variables (x) (James et al. 2014, P. Bruce and Bruce (2017)).. The goal is to build a mathematical formula that defines y as a function of the x variable. Once, we built a statistically significant model, it's possible to use it for predicting future outcome on.

4.1.2 Least-Squares Techniques. The standard technique for performing linear fitting is by least-squares regression. This chapter discusses programs that use that algorithm. However, as Emerson and Hoaglin point out, the technique is not without problems. Various methods have been developed for fitting a straight line of the form: y = a + bx to. Because the least squares line approximates the true line so well in this case, the least squares line will serve as a useful description of the deterministic portion of the variation in the data, even though it is not a perfect description. While this plot is just one example, the relationship between the estimated and true regression. Use of the Rational Method should be limited to drainage areas less than 20 acres with generally uniform surface cover and topography. It is important to note that the Rational Method can be used only to compute peak runoff rates. Since it is not based on a total storm duration, but rather a period of rain that produces the peak runoff rate

A.M. Brown /Computer Methods and Programs in Biomedicine 65 (2001) 191-200 193 where y is the data point, y fit is the value of the curve at point y, and SS is the sum of the squares. The best fit of the data is the linear function that has the smallest value for the squared sum (SS) of all the differences What is done above can also be proved by using LEAST SQUARE METHOD. The equation of least square for linear regression is the same as used in the above hand fit illustration: Y = a + be . Where: Y = Dependent variable computed by equation . Y = The actual dependent variable data point. a = Y intercept . b = Slope of the line . x = Time period To keep the results in the two tables consistent with each other, the partial sum of squares is used as the default selection for the results displayed in the ANOVA table. The partial sum of squares for all terms of a model may not add up to the regression sum of squares for the full model when the regression coefficients are correlated Standard errors are (by default) based on the expected information matrix. The only exception is when data are missing and full information ML is used (via missing = ML). In this case, the observed information matrix is used to compute the standard errors. The user can change this behavior by using the information argument Objective function to be minimized. When method is 'leastsq' or 'least_squares', the objective function should return an array of residuals (difference between model and data) to be minimized in a least-squares sense. With the scalar methods the objective function can either return the residuals array or a single scalar value

The method of ordinary least squares assumes that there is constant variance in the errors (which is called homoscedasticity). The method of weighted least squares can be used when the ordinary least squares assumption of constant variance in the errors is violated (which is called heteroscedasticity). The model under consideration i Section 6.5 The Method of Least Squares ¶ permalink Objectives. Learn examples of best-fit problems. Learn to turn a best-fit problem into a least-squares problem. Recipe: find a least-squares solution (two ways). Picture: geometry of a least-squares solution. Vocabulary words: least-squares solution. In this section, we answer the following important question For example, the least absolute errors method (a.k.a. least absolute deviations, which can be implemented, for example, using linear programming or the iteratively weighted least squares technique) will emphasize outliers far less than least squares does, and therefore can lead to much more robust predictions when extreme outliers are present sufficiently far apart and calculate the corresponding y values (or vice versa) and use these as points to draw the line. The intercept y = 0.6 (at x = 0) could be used as one point. • At 0.500 g/mL, y = 27.5. • A plot of the experimental data and the least-squares line drawn through them is shown in the Figure below The underlying calculations and output are consistent with most statistics packages. It applies the method of least squares to fit a line through your data points. The equation of the regression line is calculated, including the slope of the regression line and the intercept. We also include the r-square statistic as a measure of goodness of fit

Instrumental variables estimation - Wikipedi

Calculate the squares of the errors. In the third column of the table, find the square of each of the resulting values in the middle column. These represent the squares of the deviation from the mean for each measured value of data. For each value in the middle column, use your calculator and find the square A non-linear model function is selected that is expected to be a good fit to the calibration data (e.g. a quadratic or cubic function), a least-squares fit of that model to the data is computed, and the resulting non-linear equation is solved for concentration and used to convert readings of the unknown samples into concentration 1. The three widely used quantitative methods of separating a mixed cost into its fixed and variable components are the high-low method, the scatter plot method, and the method of least squares. a. True b. Fals

The value of is used to compute the interval size for the computation of finite-difference the fixed-effects estimates are (estimated) generalized least squares estimates. In a likelihood method that is not residual based, both the covariance parameters and the fixed-effects estimates are maximum likelihood estimates, but the former are. If barley is used that has 12 percent crude protein and corn that has 10 percent crude protein, the square calculation method will not work because the 14 percent is outside the range of the values on the left side of the square. Disregard any negative numbers that are generated on the right side of the square In this lesson, we will explore least-squares regression and show how this method relates to fitting an equation to some data. Using examples, we will learn how to predict a future value using the. Least squares fitting with Numpy and Scipy nov 11, 2015 numerical-analysis optimization python numpy scipy. Both Numpy and Scipy provide black box methods to fit one-dimensional data using linear least squares, in the first case, and non-linear least squares, in the latter.Let's dive into them: import numpy as np from scipy import optimize import matplotlib.pyplot as pl

Here we will look at some transformations which may be used to convert such data so that we may use the least squares method to find the best fitting curve. Note: Matlab uses the log function to calculate the natural logarithm, and therefore in these notes, we will use log( x ) to calculate what you would normally write as ln( x ) in your. Ordinary Least Squares is the most common estimation method for linear models—and that's true for a good reason.As long as your model satisfies the OLS assumptions for linear regression, you can rest easy knowing that you're getting the best possible estimates.. Regression is a powerful analysis that can analyze multiple variables simultaneously to answer complex research questions Financial calculators and spreadsheets can easily be set up to calculate and graph the least squares regression. Example. The least squares regression equation is y = a + bx. The A in the equation refers the y intercept and is used to represent the overall fixed costs of production. In the example graph below, the fixed costs are $20,000 Least Squares Regression is the method for doing this but only in a specific situation. A regression line (LSRL - Least Squares Regression Line) is a straight line that describes how a response variable y changes as an explanatory variable x changes. The line is a mathematical model used to predict the value of y for a given x. Regression. Introduction to logarithms: Logarithms are one of the most important mathematical tools in the toolkit of statistical modeling, so you need to be very familiar with their properties and uses. A logarithm function is defined with respect to a base, which is a positive number: if b denotes the base number, then the base-b logarithm of X is, by definition, the number Y such that b Y = X

The least squares criterion method is used throughout finance, economics, and investing. It is used to estimate the accuracy of a line in depicting the data that was used to create it. Least.. A well known way to fit data to an equation is by using the least squares method (LS). I won't repeat the theory behind the method here, just read up on the matter by clicking that link to Wikipedia. The fourth column of the table is used to calculate the sum of squares. Formula: =(B2-C2)^2. As you probably noted already, I used a couple of. Review If the plot of n pairs of data (x , y) for an experiment appear to indicate a linear relationship between y and x, then the method of least squares may be used to write a linear relationship between x and y. The least squares regression line is the line that minimizes the sum of the squares (d1 + d2 + d3 + d4) of the vertical deviation from each data point to the line (see figure.

[This is part of a series of modules on optimization methods]. The simplest, and often used, figure of merit for goodness of fit is the Least Squares statistic (aka Residual Sum of Squares), wherein the model parameters are chosen that minimize the sum of squared differences between the model prediction and the data. For N data points, Y^data_i (where i=1N), and model predictions at those. The least squares approach to regression is based upon minimizing these difference scores or deviation scores. The term deviation score should sound familiar. The sum of the X-values is used to calculate the mean or Xbar, which has a value of 5 as shown at the bottom of C1. In the case of method comparison, method X explains 95% of the.

Since it is not possible to solve the above system, we use the least squares method to find the closest solution. That is, we want to get the best fit line. Remark 5.4 By best fit line, we mean a line that minimizes the sum of the squares of the distances from each point to the line Polynomial regression is an overdetermined system of equations that uses least squares as a method of approximating an answer. To understand this let us first look at a system of equations that is not overdetermined. We can start by constructing a line function that intercepts two points: (0.1, 0.1) and (0.6, 0.8) Fitting linear models by eye is open to criticism since it is based on an individual preference. In this section, we use least squares regression as a more rigorous approach.. This section considers family income and gift aid data from a random sample of fifty students in the 2011 freshman class of Elmhurst College in Illinois. [1] Gift aid is financial aid that does not need to be paid back. The method of minimizing the sum of the squared residuals is termed least squares regression, or ordinary least squares (OLS) regression. It is often attributed to Carl Friedrich Gauss, the German mathmetician, but was first published by the French mathmetician Adrien-Marie Legendre in 1805

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Least Squares Approximation. This calculates the least squares solution of the equation AX=B by solving the normal equation A T AX = A T B. Note: this method requires that A not have any redundant rows.. All methods specific to least-squares minimization utilize a \(m \times n\) matrix of partial derivatives called Jacobian and defined as \(J_{ij} = \partial f_i / \partial x_j\). It is highly recommended to compute this matrix analytically and pass it to least_squares , otherwise, it will be estimated by finite differences, which takes a lot of. The most common statistical method used to do this is least-squares regression, which works by finding the best curve through the data that minimizes the sums of squares of the residuals. The important term here is the best curve, not the method by which this is achieved. There are a number of least-squares regressio Note: The SummaryStatistics class does not store the dataset that it describes in memory, but it does compute all statistics necessary to perform t-tests, so this method can be used to conduct t-tests with very large samples. One-sample tests can also be performed this way

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