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Unformatted text preview: Page 2 of3 Page 3 of3 Scales and their uses There are two categories of tests' indicated in the first chart above: parametric and non-parametric. Nominal Scale. Tlus is a scale where the categories (or nwnbers) are used to classiJy people. For example, a clinical psychologist might count the number ofpeople in the categories: schiwphrenia, paranoia, manic-depression, neuroticism, etc. These are categories designated by the Diagnostic and Statistical Manual. Ordinal Scale. This scale occurs when the categories have 'a relation to other. For example, take the schizophrenia, paranoia etc. categories above. If these categories can be arranged into degrees of severity (one is more severe than the next, etc.), then it forms an ordinal scale (ordered). The central tendency of the responses is given in terms of the Mode or Median value. Interval Scale. When the categories have a relation expressed numerically (e.g., the degree of severity) and not just than one category has more of something than another category, it constitutes...
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- Fall '09