qqline2: qqline for qqplot

In broman: Karl Broman's R Code

qqline for qqplot

Description

Adds a line to a quantile-quantile plot for two datasets, from stats::qqplot(). (The available stats::qqline() function works mainly for stats::qqnorm(), with one sample being theoretical quantiles.)

Usage

qqline2(x, y, probs = c(0.25, 0.75), qtype = 7, ...)

Arguments

x	The first sample
y	The second sample.
probs	numeric vector of length two, representing probabilities. Corresponding quantile pairs define the line drawn.
qtype	the type of quantile computation used in stats::quantile().
...	graphical parameters.

Value

Intercept and slope of the line.

See Also

stats::qqline(), stats::qqplot()

Examples

x <- rchisq(500, 3)
y <- rgamma(730, 3, 1/2)
qqplot(x, y)
qqline2(x, y)

broman documentation built on May 29, 2024, 7:18 a.m.