Lecture 3: Summarizing Information about a Variable: Nominal Scales

Lecture 3: Summarizing Information about a Variable: Nominal Scales

I. Proportions

Range

Rounding Error Problem

II. Percentages

Proportion times 100

More informative than raw numbers

Situations where Proportions and Percentages can be misleading

Percentages Across versus Down

Causal Direction: Dependent and Independent Variables

III. Rates

IV. Ratios