# PSYB01H3 Chapter 12: Chapter 12 - Detailed & Easy to Learn

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## Document Summary

Scales of measurement: a review: the levels of the variable can be described using 1 of 4 scales of measurement: nominal, ordinal, interval and ratio, the levels of nominal scale variables have no numerical, quantitative properties. The levels are simply different categories or groups. Most independent variable in experiments are nominal: variables with ordinal scale levels involve minimal quantitative distinctions. We can rank order the levels of the variable being studies from lowest to highest. Interval and ratio scale variables have much more detailed quantitative properties. With an interval scale variable, the intervals between the levels are equal in size. There is no absolute zero point that indicated an absence of mood: ratio scale variables have both equal intervals and an absolute zero point that indicates the absence of the variable being measured. Time, weight, length etc are the best examples. divide a whole circle or pie into slices that represent relative percentages.

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