# distribution: Functions used to describe the characteristics of estimated... In rlogit: Random parameters logit model

## Description

`rpar` objects contain all the relevant information about the distribution of random parameters. These functions enables to obtain easily descriptive statistics, density, probability and quantiles of the distribution.

## Usage

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23``` ```med(x, ...) stdev(x, ...) qrlogit(x, ...) prlogit(x, ...) drlogit(x, ...) ## S3 method for class 'rpar' mean(x, norm = TRUE, ...) ## S3 method for class 'rpar' med(x, norm = TRUE, ...) ## S3 method for class 'rpar' stdev(x, norm = TRUE, ...) ## S3 method for class 'rpar' qrlogit(x, norm = TRUE, ...) ## S3 method for class 'rpar' prlogit(x, norm = TRUE, ...) ## S3 method for class 'rpar' drlogit(x, norm = TRUE, ...) ## S3 method for class 'rlogit' qrlogit(x, par = 1, y = NULL, norm = TRUE, ...) ## S3 method for class 'rlogit' prlogit(x, par = 1, y = NULL, norm = TRUE, ...) ## S3 method for class 'rlogit' drlogit(x, par = 1, y = NULL, norm = TRUE, ...) ```

## Arguments

 `x` a `rlogit` or a `rpar` object, `norm` the variable used for normalization if any, `par` the required parameter for the `rlogit` methods (either the name or the position of the parameter, `y` values for which the function has to be evaluated, `...` further arguments.

## Details

`mean`, `med` and `stdev` compute respectively the mean, the median and the standard deviation of the random parameter. `qrlogit`, `prlogit`, `drlogit` return functions that compute the quantiles, the probability and the density of the random parameters.

## Value

a numeric vector for `qrlogit`, `drlogit` and `prlogit`, a numeric value for `mean`, `stdev` and `med`.

## Author(s)

Yves Croissant

`rlogit` for the estimation of random parameters logit models and `rpar` for the description of `rpar` objects.