Church members were grouped on the basis of responses to an appeal to participate in a questionnaire study of churches: Initial Ss (n = 58) attended the first session, Follow-up Ss (n = 29) participated when subsequent appeals were made, and Refusal Ss (n = 18) did not participate. Postcard responses to the appeal differed significantly for the 3 groups (p < .001), but sex of Ss did not. Group means of 6 behavioral measures on contributions to the church and church attendance showed an identical ordering effect: Initial Ss > Follow-up Ss > Refusal Ss. For all 6 measures, p < .05 for analyses of variance.
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References
1.
LeipoldW. D.JamesR. L.Characteristics of shows and no-shows in a psychological experiment. Psychological Reports, 1962, 11, 171–174.
2.
LevittE. E.LubinB.BradyJ. P.The effect of the pseudovolunteer on studies of volunteers for psychology experiments. Journal of Applied Psychology, 1962, 46, 72–75.
RosenthalR.The volunteer subject. Human Relations, 1965, 18, 389–406.
5.
RosenthalR.RosnowR. L.The volunteer subject. In RosenthalR. & RosnowR. L. (Eds.), Artifact in social research. New York: Academic Press, 1968, in press.
6.
WebbE. J.CampbellD. T.SchwartzR. D.SechrestL.Unobtrusive measures: nonreactive research in the social sciences. Chicago: Rand McNally, 1966.
7.
WickerA. W.Requirements for protecting privacy of human subjects: some implications for generalization of research findings. American Psychologist, 1968, 23, 70–72.
