compareqqnorm {blmeco}

Produces QQ-plots of model residuals and of random normal samples

Description

The function produces 9 QQ-Plots. One is for the residuals of a model. 8 of them are for a simulated sample of equal size as the first one but simulated from a normal distribution using rnorm. The QQ-plot for the residuals is placed at a random place within the 9 plots. If you immediately can find the QQ-Plot of the residuals, these may not be normally distributed. The place of residuals is printed to the R-console.

Usage

compareqqnorm(mod)

Arguments

mod

a linear model (an lm-object or any other object of which resid(mod) gives a numeric vector of numbers)

Value

a plot is produced and a number if given which indicates the position of the residuals (1-3 corresponds to the first row, 4-6 to the second row and 7-9 to the third row)

Author(s)

F. Korner

Examples

 y <- rexp(50)
 mod <- lm(y~1)
 compareqqnorm(mod)