Zimmerman, Donald W.Williams, Richard H.Zumbo, Bruno D.2011-10-042011-10-041993Zimmerman, Donald W, Williams, Richard H & Zumbo, Bruno D. (1993). Reliability, power, functions, and relations: A reply to Humphreys. Applied Psychological Measurement, 17, 15-16. doi:10.1177/014662169301700103doi:10.1177/014662169301700103https://hdl.handle.net/11299/116224Index terms: difference scores, error of measurement, power, significance tests, t test, test reliability, true scores.enArticle