Unformatted text preview: the point: (xbar, ybar) “Total variation in y” measures the variability of the y's about their mean ybar. If the value of x tells us nothing about the value of y, then r^2 = 0. The purpose of a residual plot is to diagnose problems with the regression equation assumptions. The least squares regression line always intersects the point: (xbar, ybar)...
View
Full Document
 Winter '11
 PattiColling
 Correlation, Least Squares, Linear Regression, Regression Analysis, Errors and residuals in statistics, squares regression line

Click to edit the document details