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Measurement

The process of applying numbers to objects according to a set of rules.

Four 'scales' of measurement

- Nominal
- Ordinal
- Interval
- Ratio

Nominal

- "Nominal" stands for "Name" of category
- Numbers are used simply as labels for groups or classes
- It is used for qualitative rather than quantitative data
- Nominal scale is the least powerful level of measurement
- Nominal scales provide convenient ways of keeping track of people, objects, and events.
- One cannot do much with the numbers involved.
- Numbers on the t-shirts of team players
- One cannot usefully average the numbers on the back of a group of players and come up with a meaningful value.
- The counting of members in each group is the only possible arithmetic operation when a nominal scale is employed

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