getPrior_delta {eggCounts} R Documentation

## Get prior parameters from Beta distribution

### Description

Compute the shape parameters from a Beta distribution for \delta based on some prior belief.

### Usage

getPrior_delta(lower, upper, p = 0.7, mode, conc, plot = TRUE)


### Arguments

 lower,upper,p numeric. Prior belief about the reduction. There is p probability that the reduction is between lower and upper. Not used if mode and conc are supplied. mode,conc numeric. Prior belief about the reduction. The mode and concentration parameters of a beta distribution. Higher concentration indicates smaller variance. Not used if lower and upper thresholds are supplied. plot logical. If TRUE, the prior distribution is plotted after parameters are found.

### Details

The multiroot function from rootSolve package is used to compute the parameters.

### Value

Returns Beta prior parameters for \delta and the printed argument to use in a fecr_stan() or a fec_stan() function call.

Tea Isler
Craig Wang

### Examples

# there is 80% probability that the reduction is between 60% and 90%
getPrior_delta(lower = 0.6, upper = 0.9, p = 0.8)


[Package eggCounts version 2.3-2 Index]