Nominal Scale:

A nominal scale is a type of measurement scale that involves categorizing variables into groups or categories based on shared characteristics or attributes. These categories are mutually exclusive and do not have any inherent order or ranking.

Characteristics of Nominal Scale:

• Mutually Exclusive: The categories or groups in a nominal scale are distinct and do not overlap. Each data point can only belong to one category.
• No Inherent Order: Unlike other measurement scales, the categories in a nominal scale do not have any inherent order or ranking. They are purely labels or names for different groups.
• Equivalent: Within the nominal scale, all categories are considered equal. There is no quantitative significance or value associated with each category.

Example:

An example of a nominal scale is categorizing people into different eye colors such as blue, green, or brown. Each person can only have one eye color, and the colors do not have any inherent order or quantitative value.