fstat (Statistics Toolbox)

Mean and variance for the F distribution

Syntax

```
[M,V] = fstat(V1,V2)
```

Description

[M,V] = fstat(V1,V2) returns the mean and variance for the F distribution with parameters specified by V1 and V2. Vector or matrix inputs for V1 and V2 must have the same size, which is also the size of M and V. A scalar input for V1 or V2 is expanded to a constant matrix with the same dimensions as the other input.

The mean of the F distribution for values of ₂ greater than 2 is

The variance of the F distribution for values of ₂ greater than 4 is

The mean of the F distribution is undefined if ₂ is less than 3. The variance is undefined for ₂ less than 5.

Examples

fstat returns NaN when the mean and variance are undefined.

[m,v] = fstat(1:5,1:5)
m =
    NaN       NaN    3.0000    2.0000    1.6667
v =
    NaN       NaN       NaN       NaN    8.8889

See Also

fcdf, finv, frnd, frnd

frnd fsurfht