qqline2 {broman}

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)