Statistical Computations: STANDARD Procedure

Standardizing values removes the location and scale attributes from a set of data. The formula to compute standardized values is

where

	is a new standardized value
S	is the value of STD=
M	is the value of MEAN=
x i	is an observation s value
x	is a variable s mean
s x	is a variable s standard deviation.

PROC STANDARD calculates the mean ( x ) and standard deviation ( S _x ) from the input data set. The resulting standardized variable has a mean of M and a standard deviation of S .

If the data are normally distributed, standardizing is also studentizing since the resulting data have a Student s t distribution.