```help mata mz_stdc()
-------------------------------------------------------------------------------

Title

mz_stdc() -- Calculates the standard deviation of each column of a matrix

Syntax

real matrix mz_stdc(x)

where

x:  real matrix

Description

mz_stdc() computes the standard deviation of each column of a matrix and
puts the result in a column vector.

Remarks

Example:

: x
1   2   3   4
+-----------------+
1 |  1   3   5   6  |
2 |  4   3   2   1  |
3 |  7   5   3   2  |
4 |  8   9   0   1  |
5 |  4   6   8   9  |
6 |  3   2   6   7  |
7 |  1   4   5   7  |
8 |  7   2   4   6  |
9 |  1   4   0   3  |
10|  1   4   6   7  |
+-----------------+

: mz_stdc(x)
1
+---------------+
1 |  2.790858092  |
2 |  2.097617696  |
3 |  2.643650675  |
4 |  2.884826203  |
+---------------+

Conformability

mz_stdc(x)
x:  r x c
result:  c x 1.

Diagnostics

mz_stdc() returns an empty column vector if x is a row vector. In
addition, to compute the standard deviations, mz_stdc() uses N-1 rather
than N as divisor, where N is the number of rows of matrix x. To convert
to the alternate definition, multiply the output of mz_stdc() by
sqrt((N-1)/N).

Source code

mz_stdc.mata

Author