September 2017
Beginner to intermediate
446 pages
9h 17m
English
book
Data Analysis with IBM SPSS Statistics
by James C. Mott, Ken Stehlik-Barry, James Sugrue, Anthony Babinec
Content preview from Data Analysis with IBM SPSS Statistics
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Descriptives for standardized scores
Descriptives is an easy-to-use procedure that produces summary statistics for numeric fields. An added feature is that you can compute and add standardized versions of select fields to your active Data Editor window. Here, standardization refers to scaling a variable relative to its sample mean and standard deviation, which produces a new variable with a mean of 0 and standard deviation of 1.
The purpose of deriving standardized variables is to take advantage of known properties of the normal distribution. Note that the theoretical normal distribution is an ideal type, and the empirical distribution of the data will at best only approximate the theoretical normal distribution. In addition, the normal distribution ...
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