Which data scale involves ordered categories such as cancer stages?

• A. Nominal Scale
• B. Interval Scale
• C. Ratio Scale
• D. Ordinal Scale

Answer: (D)

Understanding data scales: cancer stages represent an orderable progression. In an ordinal scale, categories have a meaningful order, but the differences between adjacent categories aren’t assumed to be equal. Cancer stages I through IV are naturally ranked from less to more advanced, so you can say stage IV is more advanced than stage III, but you can’t quantify the exact difference in severity between stages as a fixed amount.

Other scales don’t fit as well. A nominal scale would only label categories without any order, which isn’t accurate for cancer stages. An interval scale requires equal distances between values, which we can’t assume between stages. A ratio scale requires a true zero and meaningful ratios, which doesn’t apply to stages. Therefore, the appropriate data scale for ordered cancer stages is ordinal.