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Chapter 6 - Chapter 6 Indexes Scales and Typologies...

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Chapter 6- Indexes, Scales, and Typologies Introduction - 2 types of composite measures of variables: indexes and scales - They allow us to summarize several indicators in a single numerical score Indexes versus Scales - Both scales and indexes are ordinal measure of variables - Index= accumulating scores assigned to individual indicators - Scale=assigning scores to patterns of responses - A scale takes advantage of differences in intensity among the attributes of the same variable - Scale is superior because it conveys more info - Indexes are more popular, obvious and straightforward Index Construction (4 steps) Item Selection 1. Face Validity - Are the questions asking about the same concept? 2. Unidimensionality - Represent only 1 dimension of a concept 3. General or Specific 4. Variance Examination of Empirical Relationships - An empirical relationship is established when respondents’ answers to one question help us predict how they will answer other questions -
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