# COLSTDEV

## Purpose:

Produces a row of the standard deviations of each column in the input table.

## Syntax:

COLSTDEV(a)

 a - A series or table.

## Returns:

A one-row table with the same number of columns as the input table.

## Example:

colstdev(ravel({1,2,3},{2,3,4}))

returns {{1, 1}}

## Remarks:

COLSTDEV computes the sample standard deviation for each column of a series where the sample standard deviation is defined as:

where the arithmetic mean is defined as:

COL

COLLENGTH

COLMAX

COLMEAN

COLMEDIAN

COLMIN

COLRMS

STDEV

TRANSPOSE