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RELIABILITY - DEFINITION "Reliability refers to the purity and consistency of a measure, to repeatability, to the probability of obtaining the same results again if the measure were to be duplicated" (Oppenheim, 1992, p. 144).Some other forms of reliability testing include the following: alternate forms,
split-half, test-retest. DeVellis (1991, ch 3) deals with these fairly comprehensively. Reference: Oppenheim, A. N. (1992) Questionnaire Design, Interviewing and Attitude Measurement: New Edition. London, Pinter. DeVellis, R. F. (1991). Scale Development: Theory and Applications. London: SAGE. Back to Which Test Home Page |