Index

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An index is a set of multiple, related measures that are combined to better measure an abstract concept. In an evaluation survey, a number of similar questions could be asked to measure someone’s attitudes toward a program. For example:

Rate your agreement or disagreement with the following statements:

  • Overall, I enjoyed this program

  • This program improved my quality of life

  • I would recommend this program to a friend

  • I learned something new at this program

We could ask respondents to indicate their agreement to each statement on a scale from 1 to 5 (i.e., a Likert-type scale), then their responses would be combined to create an index.

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Independent variable