var

Syntax

var(X)

Arguments

X is a scalar/vector/matrix.

Details

If X is a vector, return the the (unbiased) sample standard variance of X.

If X is a matrix, calculate the the (unbiased) sample standard variance of each column of X and return a vector.

As with all aggregate functions, NULL values are not included in the calculation.

Note: The result is sample variance instead of population variance.

Examples

var(1 1 1);
// output
0
var(1 2 3);
// output
1

m=matrix(1 3 5 7 9, 1 4 7 10 13);
m;
#0 #1
1 1
3 4
5 7
7 10
9 13 
var(m);
// output
[10,22.5]

Related functions: covar and corr