SPSS Statistics Variables Level of Measurement

By Keith McCormick, Jesus Salcedo, Aaron Poh

Part of SPSS Statistics For Dummies Cheat Sheet

In SPSS Statistics, the level of measurement of the variables defines which summary statistics and graphs should be used. The following table provides definitions, examples, appropriate summary statistics, and graphs for the level of measurement of the variables.

Nominal Ordinal Scale
Definition Unordered categories Ordered categories Both interval and ratio
Examples Gender, geographic location, job category Satisfaction ratings, income groups, ranking of
preferences
Number of purchases, cholesterol level, age
Measures of Central Tendency Mode Median Median or mean
Measures of Dispersion None Min/max/range Min/max/range, Standard deviation/ variance
Graph Pie or bar Bar Histogram