Statistical significance is not a ’kosher certificate’ for observed effects: A critical analysis of the two-step approach to the evaluation of empirical results. (English)
Educ. Researcher 29, No. 1, 31-34 (2000).
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A between-grade-levels approach to the investigation of the absolute effects of schooling on achievement. Eine Untersuchung der absoluten Auswirkungen von Schulunterricht auf Leistung nach der ’Zwischen-den-Jahrgangsstufen-Methode’. (English)
Am. Educ. Res. J. (Spr 1987) v. 24(1) p. 1-12. CODEN: AECJAX [ISSN 0002-8312]
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The Cumulative Effect of Ability Grouping on Mathematical Achievement: A Longitudinal Perspective. (English)
Stud. Educ. Eval. 22, No. 1, 29-40 (1996).
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