R: Selection of Beta Prior Given Knowledge of Two Quantiles

beta.select {LearnBayes} | R Documentation

## Selection of Beta Prior Given Knowledge of Two Quantiles

### Description

Finds the shape parameters of a beta density that matches knowledge of two quantiles of the distribution.

### Usage

    beta.select(quantile1, quantile2)

### Arguments

`quantile1` | list with components p, the value of the first probability, and x, the value of the first quantile
`quantile2` | list with components p, the value of the second probability, and x, the value of the second quantile

### Value

vector of shape parameters of the matching beta distribution

### Author(s)

Jim Albert

### Examples

    # person believes the median of the prior is 0.25
    # and the 90th percentile of the prior is 0.45
    quantile1=list(p=.5,x=0.25)
    quantile2=list(p=.9,x=0.45)
    beta.select(quantile1,quantile2)

[Package LearnBayes version 2.15 Index]