var

Compute the variance of x.

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Usage 1

var(xvector)

Result 1

The variance v of vector x.

v = sumi = 0..ncol(x)-1 ( (xi - avr(x))^2 ) / (ncol(x) - 1)

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Usage 1

var(xvector, yvector)

Result 1

The covariance v of the vectors x and y.

v = sumi = 0..ncol(x) ( (xi - avr(x)) * (yi - avr(y)) )

Usage:	var(xv)
Result type:	scalar

The covariance of the vector xv and yv.

Usage:	var(xv,ys)
Result type:	scalar

The covariance matrix for the column vector of the matrix xM. The column average a[j] is either calculated with avr(xM[*,j]) or through the argument y (a[j] = yS or a[j] = yV[j]).

Usage:	var(xm)
	var(xm,ys)
	var(xm,yv)
Result type:	matrix - (ncol(xm) x ncol(xm))