A Program for Sample Size
and Power Calculations
Version 1.0, 8/June/1990
(c) 1989, 1990
Kevin M. Sullivan
Division of Nutrition
Centers for Disease Control
1600 Clifton Rd. NE, MS A08
Atlanta, GA 30333
SAMPSIZE computes sample sizes for cohort/cross sectional
studies and for unmatched case-control studies. The
formulas used are from:
Kelsey JL, Thompson WD, and Evans AS: Methods in
Observational Epidemiology, Oxford University Press,
New York, 1986 (see tables 10-11 and 10-15)
Fleiss JL: Statistical Methods for Rates and
Proportions, John Wiley & Sons, New York, 1981 (see
formulas 3.18 and 3.19).
Sample size calculations for Population Attributable
Fraction (PAF) are based on formulae from:
Browner WS, Newman TB. Sample size and power based on
the population attributable fraction. Am J Public
Health 1989; 79:1289-1294.
Power calculations for cohort/cross sectional studies and
for case-control studies are based on:
Schlesselman JJ: Case-Control Studies, Oxford
University Press, New York, 1982 (see formula 6.9).
Should you have any suggestions or comments, please
NON-WARRANTY. SAMPSIZE is provided "as is" and without any
warranty expressed or implied. The user assumes all risks of
the use of SAMPSIZE. SAMPSIZE may not run on your particular
hardware/software configuration. We bear no responsibility
for any mishap or economic loss resulting therefrom the use
of this software.
COPYRIGHT CONDITIONS. You may make and distribute copies of
SAMPSIZE provided that there is no material gain involved.
USE AT YOUR OWN RISK. All risk of loss of any kind due to
the use of SAMPSIZE is with you, the user. You are
responsible for all mishaps, even if the program proves to
be defective. This program makes certain assumptions about
the data. These assumptions affect the validity of
conclusions made based on the output from this program.
Please acknowledge SAMPSIZE in any manuscript that uses