GammaDist function

The Gamma distribution

We provide convenient extensions of the [dpq]gamma functions, which allow the distribution to be specified in terms of its mean and standard deviation, instead of shape and rate/scale.

qgamma(
  p,
  shape,
  rate = 1,
  scale = 1/rate,
  lower.tail = TRUE,
  log.p = FALSE,
  mean,
  sd
)

dgamma(x, shape, rate = 1, scale = 1/rate, log = FALSE, mean, sd)

pgamma(
  q,
  shape,
  rate = 1,
  scale = 1/rate,
  lower.tail = TRUE,
  log.p = FALSE,
  mean,
  sd
)

Arguments

• p: vector of probabilities
• shape, rate, scale, log, lower.tail, log.p: see stats::GammaDist
• mean, sd: mean and standard deviation, overriding shape and rate or scale if specified
• x, q: vector of quantiles

Returns

Numeric vector of length equal to the maximum of the lengths of the input arguments.