Nominal Scale
Nominal measurement consists of assigning items to groups or categories. No quantitative information is conveyed and no ordering of the items is implied. Nominal scales are therefore qualitative rather than quantitative. Religious preference, race, and sex are all examples of nominal scales.
Frequency distributions are usually used to analyze data measured on a nominal scale. The main
statistic computed is the
mode.
Variables measured on a nominal scale are often referred to as categorical or qualitative variables.