fitFDist {limma} | R Documentation

## Moment Estimation of Scaled F-Distribution

### Description

Moment estimation of the parameters of a scaled F-distribution given one of the degrees of freedom. This function is called internally by `ebayes` and is not usually called directly by a user.

### Usage

    fitFDist(x,df1)

### Arguments

`x` | numeric vector or array of positive values representing a sample from an F-distribution.
`df1` | the first degrees of freedom of the F-distribution. May be an integer or a vector of the same length as `x`.

### Details

The function estimates `scale` and `df2` under the assumption that `x` is distributed as `scale` times an F-distributed random variable on `df1` and `df2` degrees of freedom.

### Value

A list containing the components

`scale` | scale factor for F-distribution
`df2` | the second degrees of freedom of the F-distribution

### Author(s)

Gordon Smyth

### See Also

`ebayes`, `trigammaInverse`

[Package limma version 2.8.1 Index]