# Documentation

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# geostat

Geometric mean and variance

## Syntax

`[m,v] = geostat(p)`

## Description

`[m,v] = geostat(p)` returns the mean `m` and variance `v` of a geometric distribution with corresponding probability parameters in `p`. `p` can be a vector, a matrix, or a multidimensional array. The parameters in `p` must lie in the interval `[0,1]`.

## Examples

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Define a probability vector that contains six different parameter values.

```p = 1./(1:6) ```
```p = 1.0000 0.5000 0.3333 0.2500 0.2000 0.1667 ```

Compute the mean and variance of the geometric distribution that corresponds to each value contained in probability vector.

```[m,v] = geostat(1./(1:6)) ```
```m = 0 1.0000 2.0000 3.0000 4.0000 5.0000 v = 0 2.0000 6.0000 12.0000 20.0000 30.0000 ```

The returned values indicate that, for example, the mean of a geometric distribution with probability parameter p equal to 1/3 is 2, and its variance is 6.

## More About

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### Geometric Distribution Mean and Variance

The mean of the geometric distribution is

`$\text{mean}=\frac{1-p}{p}\text{\hspace{0.17em}},$`

and the variance of the geometric distribution is

`$\mathrm{var}=\frac{1-p}{{p}^{2}}\text{\hspace{0.17em}},$`

where p is the probability of success.

## See Also

#### Introduced before R2006a

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