nominal scale
A nominal scale is a type of measurement used to categorize data without any quantitative value. It assigns labels or names to different categories, allowing for the classification of items based on attributes. For example, in a survey, responses like male, female, and non-binary represent different categories of gender.
This scale does not indicate any order or ranking among the categories; it simply identifies them. Other examples include colors like red, blue, and green, or types of fruit such as apple, banana, and orange. Each category is distinct and cannot be mathematically manipulated.