animation: sim.qqnorm – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

sim.qqnorm

Simulation of QQ plots for the Normal distribution

Description

This demo shows the possible QQ plots created by random numbers generated from a Normal distribution so that users can get a rough idea about how QQ plots really look like.

Usage

sim.qqnorm(n = 20, last.plot = NULL, ...)

Arguments

`n`	integer: sample size
`last.plot`	an expression to be evaluated after the plot is drawn, e.g. `expression(abline(0, 1))` to add the diagonal line
`...`	other arguments passed to `qqnorm`

Details

When the sample size is small, it is hard to get a correct inference about the distribution of data from a QQ plot. Even if the sample size is large, usually there are outliers far away from the straight line. Therefore, don't overinterpret the QQ plots.

Value

NULL

Author(s)

Yihui Xie

References

Examples at https://yihui.name/animation/example/sim-qqnorm/