Binary variables By Jim Frost If you can place an observation into only two categories, you have aÂ binary variable. For example pass/fail data are binary. With binomial data, you can calculate and assess proportions and percentages. Related Related Articles: Choosing the Correct Type of Regression AnalysisGuide to Data Types and How to Graph Them in StatisticsComparing Hypothesis Tests for Continuous, Binary, and Count DataNominal, Ordinal, Interval, and Ratio ScalesGoodness-of-Fit Tests for Discrete Distributions