Reliability Analysis - Discovering Statistics

C8057 (Research Methods II): Reliability Analysis Dr. Andy Field Page 1 2/15/2006 Reliability Analysis Measures of Reliability Reliability : the fact that a scale should consistently reflect the construct it is measuring. One way to think of Reliability is that other things being equal, a person should get the same score on a questionnaire if they complete it at two different points in time (test-retest Reliability . Another way to look at Reliability is to say that two people who are the same in terms of the construct being measured, should get the same score. In statistical terms, the usual way to look at Reliability is based on the idea that individual items (or sets of items) should produce results consistent with the overall questionnaire. The simplest way to do this is in practice is to use split half Reliability .)

However, Cortina (1993) notes that such general guidelines need to be used with caution because the value of alpha depends on the number of items on the scale (see Field, 2005 for details). Alpha is also affected by reverse scored items. For …

Loading..

Tags:

  Raction

Information

Related search queries