Reliability of Self-Report Measures of Drug Use in Prevention Research: Evaluation of the Project Smart Questionnaire via the Test-Retest Reliability Matrix
1984 ◽
Vol 14
(2)
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pp. 175-193
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Keyword(s):
Drug Use
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The present article describes an evaluation of a self-report questionnaire administered to whole classrooms of 7th graders. Using the test-retest reliability matrix (based on concepts of Cronbach [1] and Campbell and Fiske [2]), eight of nine drug-use indices appeared to have acceptable to good reliability. The three measures included in the test-retest reliability matrix provide stronger evidence for good reliability than could any single measure.