ABSTRACT
Continuous (interval) data: Measured on an arithmetic scale. Example: height, weight, blood pressure, heart rate, FEV1. Nominal (categorical) data: Divided into two (binomial) or more unordered, discrete categories. Examples: sex, race, religion. Ordinal data: A predetermined ordering (ranking) of nominal (categorical) data. Example: SES, Likert scale, qualitative and functional scales.
