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.
Please note that the result is sample variance instead of population variance.
Examples
$ var(1 1 1);
0
$ var(1 2 3);
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);
[10,22.5]