The Gamma Distribution — qgamma2 • ggrrr

Density, distribution function, quantile function and random generation for the Gamma distribution with parameters shape and scale.

Usage

qgamma2(
  p,
  mean,
  sd = sqrt(mean),
  lower.tail = TRUE,
  log.p = FALSE,
  convex = TRUE
)

Arguments

p: vector of probabilities
mean: the mean value on the true scale (vectorised)
sd: the standard deviation on the true scale (vectorised)
lower.tail: logical; if TRUE (default), probabilities are P[X<=x] otherwise P[X>x].
log.p: logical; if TRUE, probabilities p are given as log(p).
convex: Show a warning if the distribution selected is not a convex function

Value

dgamma gives the density, pgamma gives the distribution function, qgamma gives the quantile function, and rgamma generates random deviates.

Invalid arguments will result in return value NaN, with a warning.

The length of the result is determined by n for rgamma, and is the maximum of the lengths of the numerical arguments for the other functions.

The numerical arguments other than n are recycled to the length of the result. Only the first elements of the logical arguments are used.

See also

stats::qgamma()

Examples

qgamma2(c(0.25,0.5,0.75), 2, 1)
#> [1] 1.267660 1.836030 2.554714