Categorical variable

The values of a categorical variable are labels, so arithmetic like averaging them has no meaning. For example, eye color with values blue, brown, and green is categorical, as are yes or no answers. You summarize categorical data with counts and proportions, and display it with bar graphs. If 30 of 120 people have blue eyes, the proportion is $30 / 120 = 0.25$, or 25 percent.