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Peer reviewedLabouvie, Erich W.; And Others – Child Development, 1974
The effects of selective dropout and retesting on the assessment of developmental changes in abilities during adolescence are examined. (ST)
Descriptors: Adolescents, Age Differences, Longitudinal Studies, Measurement
Peer reviewedMintz, Jim; And Others – Journal of Consulting and Clinical Psychology, 1981
Explores the issues of patient homogeneity, external validity, internal validity, choosing and implementing specific treatment modalities, therapist experience and attitudes, therapist age, reliability and validity of measures, and problems obtaining follow-up information when studying treatment of depressed elderly patients. (Author)
Descriptors: Age Differences, Age Discrimination, Counseling Techniques, Counselor Attitudes
Download full textQian, Gaoyin – 1993
Some methodological issues in the study of levels of knowledge are reviewed, and needs for further research are explored, drawing on an analysis of 12 studies reported since the late 1970s. In the 12 studies, 16 quantitative experiments were conducted. These were assessed for internal and external validity. Analysis revealed some shortcomings in…
Descriptors: Age Differences, Data Collection, Educational Research, Effect Size
