|Type of scale||Meaningful||Examples|
|Order of categories||Distances between categories||Ratios between values|
|Ordinal||Yes||No||No||Maclean's rankings of university libraries.
MLIS students' ranking of electives.
|Interval||Yes||Yes||No||Year a book was published.
Date a Web site was last updated.
|Ratio||Yes||Yes||Yes||Number of days a book was on loan.
Number of bytes in a file.
|Type of scale||Measures of central tendency||Measures of dispersion|
|Concentration measures, such as Simpson's l|