gamma_dist_def: Generate a Gamma Distribution Definition Based on Parameter...

In epiforecasts/EpiNow: Estimate Realtime Case Counts and Time-varying Epidemiological Parameters

Description

Generates a distribution definition when only parameter estimates are available for gamma distributed parameters. See rgamma for distribution information.

Usage

gamma_dist_def(
  shape,
  shape_sd,
  scale,
  scale_sd,
  mean,
  mean_sd,
  sd,
  sd_sd,
  max_value,
  samples
)

Arguments

shape	Numeric, shape parameter of the gamma distribution.
shape_sd	Numeric, standard deviation of the shape parameter.
scale	Numeric, scale parameter of the gamma distribution.
scale_sd	Numeric, standard deviation of the scale parameter.
max_value	Numeric, the maximum value to allow. Defaults to 120. Samples outside of this range are resampled.
samples	Numeric, number of sample distributions to generate.

Value

A data.table definining the distribution as used by dist_skel

Examples

## Using estimated shape and scale
def <- gamma_dist_def(shape = 5.807, shape_sd = 0.2,
               scale = 0.9, scale_sd = 0.05,
               max_value = 20, samples = 10)
               
print(def)

def$params[[1]]

## Using mean and sd
def <- gamma_dist_def(mean = 3, mean_sd = 0.5,
               sd = 3, sd_sd = 0.1,
               max_value = 20, samples = 10)
               
print(def)

def$params[[1]]

epiforecasts/EpiNow documentation built on Oct. 26, 2020, 2:38 p.m.