May 2008
Intermediate to advanced
320 pages
8h 39m
English
book
Performance Evaluation: Proven Approaches for Improving Program and Organizational Performance
by Ingrid Guerra-López
Content preview from Performance Evaluation: Proven Approaches for Improving Program and Organizational Performance
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SCALES OF MEASUREMENT
One key consideration in collecting data is using the appropriate level of measurement. There are four levels of measurement, and each possesses unique characteristics:
- Nominal: essentially used to name
- Ordinal: to convey rank order
- Interval: to convey equal intervals in addition to conveying rank
- Ratio: in addition to all the previous characteristics, involves an absolute zero point
Nominal and ordinal data are usually associated with qualitative data, and interval and ratio data are referred to as quantitative data. Table 10.1 illustrates the unique characteristics of each scale and gives examples of data for each.
TABLE 10.1. Scales of Measurement
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