Machine Learning with R Cookbook - Second Edition

How it works...

The plot function generates four diagnostic plots of a regression model:

• The upper-left plot shows residuals versus fitted values. Within the plot, residuals represent the vertical distance from a point to the regression line. If all points fall exactly on the regression line, all residuals will fall exactly on the dotted gray line. The red line within the plot is a smooth curve with regard to residuals, and if all the dots fall exactly on the regression line, the position of the red line should exactly match the dotted gray line.
• The upper-right shows the normal for the residuals. This plot verifies the assumption that residuals were normally distributed. Thus, if the residuals were normally distributed, they should lie ...