betastat (Statistics Toolbox)

Mean and variance for the beta distribution

Syntax

```
[M,V] = betastat(A,B)
```

Description

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

The mean of the beta distribution with parameters a and b is and the variance is

Examples

If parameters a and b are equal, the mean is 1/2.

a = 1:6;
[m,v] = betastat(a,a)
m =
    0.5000    0.5000    0.5000    0.5000    0.5000    0.5000
v =
    0.0833    0.0500    0.0357    0.0278    0.0227    0.0192

betarnd binocdf