float variance
(x, xdim) |
STATFUNS.C |
Level
3 |

float
*x |
The x input vector. |

int
xdim |
The dimension of x. |

variance() returns the variance of x which is defined
as S (x -
<x>)(x - <x>)/(xdim -
1).
This formula incorporates Bessel's correction to the standard deviation which replaces xdim in the denominator with xdim -
1. Here <x> is the average of x. |