Convert to Standard Scores

This page will convert the individual values in a data set into their corresponding standard scores according to the conventional formula

zi =
XiM
SD

where
Xi = any particular value in the data set;
M = the mean of the data set; and
SD = the standard deviation of the data set.


The option is provided for converting values of X to values of z using either the descriptive standard deviation or the inferential standard deviation:

Descriptive SDQ
Inferential SD
SD =
(XiM)2
N
SD =
(XiM)2
N−1

The descriptive SD is the standard deviation of this particular sample of X values; the inferential SD is the estimated standard deviation of the population from which the sample is drawn.


Procedure:

Data Entry
Converted Data






Q

Q



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