Language Reference |
VAR Function |
The VAR function computes a sample variance of data. The arguments are as follows:
specifies an numerical matrix. The VAR function computes the variance of the columns of this matrix.
The VAR function computes the sample variance of a column vector x as where is the number of nonmissing values of x and any missing values have been excluded. When x is a matrix, the sample variance is computed for each column, as the following example shows:
x = {5 1 10, 6 2 3, 6 8 5, 6 7 9, 7 2 13}; var = var(x); print var;
The following statemen computes the standard deviation of each column:
sd = sqrt(var(x));
The VAR function returns a missing value for columns with fewer than two nonmissing observations.
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