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Titolo:
ESTIMATING SAMPLE SIZES FOR REPEATED MEASUREMENT DESIGNS
Autore:
OVERALL JE; DOYLE SR;
Indirizzi:
UNIV TEXAS,SCH MED,DEPT PSYCHIAT & BEHAV SCI,POB 20708 HOUSTON TX 77225
Titolo Testata:
Controlled clinical trials
fascicolo: 2, volume: 15, anno: 1994,
pagine: 100 - 123
SICI:
0197-2456(1994)15:2<100:ESSFRM>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERSONALITY; MODEL;
Keywords:
SAMPLE SIZE; REPEATED MEASUREMENTS; ANALYSIS OF VARIANCE; ANALYSIS OF COVARIANCE; POWER; LINEAR TREND TESTS; DIFFERENCE SCORES; BASE-LINE CORRECTION; SYMMETRY ASSUMPTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
J.E. Overall e S.R. Doyle, "ESTIMATING SAMPLE SIZES FOR REPEATED MEASUREMENT DESIGNS", Controlled clinical trials, 15(2), 1994, pp. 100-123

Abstract

Formulas for estimating sample sizes that are required to provide specified power for analysis of variance (ANOVA) tests of significance ina two-group repeated measurements design are presented and evaluated. Power and sample size requirements depend on the pattern of treatmenteffects and the pattern of correlations among the repeated measurements, as well as on parameters common to sample size estimation for cross-sectional comparisons of treatment effects in simple randomized designs. Simplifying assumptions permit generation of these numerous parameter estimates from predictions of the magnitude of the standardized ''effect size'' at end of trial and the single correlation between the baseline and endpoint measurements. Monte Carlo methods are used to verify the actual power of different tests of significance for treatmenteffects in repeated measurement designs using sample sizes estimated by the formulas. The sample size implications of different patterns oftreatment effects, levels of correlation, and numbers of repeated measurements are evaluated.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 06:20:37