DAAG (version 0.34)

qreference: Normal QQ Reference Plot

Description

This function computes the normal QQ plot for given data and allows for comparison with normal QQ plots of simulated data.

Usage

qreference(test=NULL, mu = 10, sigma = 1, m = 50, nrep = 5,
             seed=NULL, nrows=NULL, cex.points=0.65, cex.strip=0.75)

Arguments

test

a vector containing a sample to be tested

mu

the mean of the simulated reference samples

sigma

the standard deviation of the reference samples

m

the sample size for the reference samples; default is test sample size if test sample is supplied

nrep

the total number of samples, including reference samples and test sample if any

seed

the random number generator seed

nrows

number of rows in the plot layout

cex.points

character expansion factor for plotted points

cex.strip

character expansion factor for labels

Value

• QQ plots of the sample (if non-null) and all reference samples

Examples

qreference(rt(180,1))

qreference(rexp(180), nrep = 4)

data(toycars)
toycars.lm <- lm(distance ~ angle + factor(car), data = toycars)
qreference(residuals(toycars.lm), nrep = 9)