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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Types of Measurement Scales—a Weighty Topic

Who would have thought of so many ways to look at data? The final way to classify data is by the way it is measured. This distinction is critical because it affects which statistical techniques we can use in our analysis of the data. Measurement classification can be made in several levels.

Nominal Level of Measurement

A nominal level of measurement deals strictly with qualitative data. Observations are simply assigned to predetermined categories. One example is gender of the respondent, with the categories being male and female. Another example is data indicating the type of dog, if any, owned by families in a neighborhood. The categories for this data are the various dog types (black Lab, terrier, ...

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