what is a nominal scale

A nominal scale is a measurement scale in which numbers serve as "tags" or "labels" only to identify or classify an object. Nominal scales are used for labeling variables without any quantitative value, and they possess only the description characteristic, which means they possess unique labels to identify or delegate values to the items. Nominal scales are qualitative in nature, which means numbers are used here only to identify the objects. Nominal scales are used when a variable is divided into two or more categories, for example, agree/disagree, yes or no, etc. . Nominal scales are used for counting purposes only, and they cannot be used to calculate the mean, median, or standard deviation for nominal variables because you only have information about categories. The mode is the proper measure of central tendency for nominal scales because it identifies the most common category.