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Scales of Measurement

Scales of Measurement . What is a nominal scale?. A scale that categorizes items. What is an ordinal scale?. A scale that categorizes and rank orders items. A scale that categorizes and rank orders items, and has equal intervals. What is an interval scale?.

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Scales of Measurement

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  1. Scales of Measurement What is a nominal scale? A scale that categorizes items What is an ordinal scale? A scale that categorizes and rank orders items A scale that categorizes and rank orders items, and has equal intervals What is an interval scale? A scale that categorizes and rank orders items, has equal intervals, and a zero that means the absence or none of the thing being measured What is a ratio scale?

  2. Types of Variables • Discrete Variables: • consists of separate categories • Continuous Variables: • Variable that is not measured on distinct categories

  3. Real Limits • A score on a continuous variables could fall anywhere on the scale, even between units • On a continuous scale of 1 to 5, it is possible to obtain a 2.5 • Real Limits are used to account for this possibility • They define boundaries at +/- half of a unit of the scale • If a scale is in units of 1, then the real limit is +/- 0.5 for each score

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