![]() You can code nominal variables with numbers if you want, but the order is arbitrary and any calculations, such as computing a mean, median, or standard deviation, would be meaningless. ![]() Knowing the scale of measurement for a variable is an important aspect in choosing the right statistical analysis.Ī nominal scale describes a variable with categories that do not have a natural order or ranking. These are still widely used today as a way to describe the characteristics of a variable. In the 1940s, Stanley Smith Stevens introduced four scales of measurement: nominal, ordinal, interval, and ratio.
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