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Titolo:
IMPACT OF MEASUREMENT ERROR ON STATISTICAL POWER - REVIEW OF AN OLD PARADOX
Autore:
WILLIAMS RH; ZIMMERMAN DW; ZUMBO BD;
Indirizzi:
UNIV MIAMI,SCH EDUC,DEPT EDUC & PSYCHOL STUDIES,POB 248065 CORAL GABLES FL 33124 CARLETON UNIV OTTAWA ON K1S 5B6 CANADA
Titolo Testata:
The Journal of experimental education
fascicolo: 4, volume: 63, anno: 1995,
pagine: 363 - 370
SICI:
0022-0973(1995)63:4<363:IOMEOS>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEPENDENT VARIABLE RELIABILITY; SIGNIFICANCE TESTS; DIFFERENCE SCORES; CONTRADICTIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
R.H. Williams et al., "IMPACT OF MEASUREMENT ERROR ON STATISTICAL POWER - REVIEW OF AN OLD PARADOX", The Journal of experimental education, 63(4), 1995, pp. 363-370

Abstract

The relation between test reliability and statistical power has been a controversial issue, perhaps due in part to a 1975 publication in the Psychological Bulletin by Overall and Woodward, ''Unreliability of Difference Scores: A Paradox for the Measurement of Change,'' in which they demonstrated that a Student t test based on pretest-posttest differences can attain its greatest power when the difference score reliability is zero. In the present article, the authors attempt to explain this paradox by demonstrating in several ways that power is not a mathematical function of reliability unless either true score variance or error score variance is constant.

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Documento generato il 16/07/20 alle ore 06:35:23