Building upon this is the ordinal scale, which introduces a ranking or ordering to the categories. The nominal scale deals with names or labels; it classifies observations into mutually exclusive categories where no order or structure is implied.
Nominal Ordinal Interval Ratio Scale Guide
"Satisfaction rating" (1 to 5) is ordinal—you know the order, but the gap between 1 and 2 may not equal the gap between 4 and 5. The interval scale has order, equal intervals, and known differences, but it lacks a true zero point.
" Limitations of Categorical and Ranked Data With nominal data, mathematical operations are largely restricted to counting frequencies and determining modes. "Customer ID" is nominal—it categorizes without order.
Nominal Ordinal Interval Ratio Scale Guide
You can identify the most common category or calculate percentages, but you cannot logically compute a mean or a standard deviation. " Ratio scales, however, possess all the properties of interval scales with the critical addition of an absolute zero point, indicating the complete absence of the quantity being measured.
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