Sample size formula with a continuous outcome for unequal group sizes and unequal variances

Statistics in Medicine

Volumn 18, Issue 1, 1999, Pages 87-91

  Schouten, Hubert J A ^a  

^a MAASTRICHT UNIVERSITY   (Netherlands)

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; MATHEMATICAL ANALYSIS; SAMPLE; VARIANCE;

ANALYSIS OF VARIANCE; HUMANS; PATIENTS; SAMPLE SIZE;

EID: 0033555868     PISSN: 02776715     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1097-0258(19990115)18:1<87::AID-SIM958>3.0.CO;2-K     Document Type: Article

References (8)

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3. Walker, A. M. 'Low power and striking results - a surprise but not a paradox', New England Journal of Medicine, 332, 1091-1092 (1995).
4. Snedecor, G. W. and Cochran, W. G. Statistical Methods (Section 6.14), The Iowa State University Press, Ames, 1980.
5. Stuart, A. and Ord, J. K. Kendall's Advanced Theory of Statistics, Griffin, London, 1987, Chapter 10.
6. Machin, D. and Campbell, M. J. Statistical Tables for the Design of Clinical Trials, Blackwell, Oxford, 1987, Chapter 7.
7. Campbell, M. J., Julious, S. A. and Altman, D. G. 'Estimating sample sizes for binary, ordered categorical, and continuous outcomes in two group comparisons', British Medical Journal, 311, 1145-1148 (1995).
8. Moser, B. K. and Stevens, G. R. 'Homogeneity of variance in the two-sample means test', American Statistician, 46, 19-21 (1992).