;
Purpose: Calculates statistical power
and sample size for ;
the difference between two
proportions ;
(independent
groups) ;
;
ALSO USED FOR TWO-GROUP TWO-
PERIOD CROSS OVER ;
DESIGNS
;
;
Calculations are based on Machin, D.
and Campbell, M.J. (1987).;
;
Created: 16 March
1995
;
;
Input file: NONE (see
notes) ;
Output file: NONE (see
notes) ;
;
Notes: Data is entered after the
cards statement Enter ;
power alpha pie1 pie2 and each
separated by a space ;
−9 is used for the parameter
to be estimated, only ;
one −9 should be entered per
line (i.e., 3 parameters ;
are entered and 1 is
estimated) only POWER or ;
N can be
estimated.
;
;
Pie1 and pie2 are the two
proportions (pie1 is the ;
smallest).
;
This is a two-sided test, for
a 1-sided test change ;
Appendix 353