I am trying to produce the sample size for various value of power? I can do it for one specific value of power (say 0.90). I plan to write do loop over different power values (0.8 to 0.95 increased by 0.01). Also save the data that will have, alpha, power, p1, p2 and sample size.
I can do it only for one power value as showed below.
proc power;
twosamplefreq test=pchi
groupproportions = (0.16 0.11 )
sides=1
nullproportiondiff=0
alpha = 0.0249
power = 0.90
ntotal = .
;
run;
You can actually do this in PROC POWER
directly by saying power=0.8 to 0.95 by 0.01
.
PROC POWER
does not output datasets natively, but you can output the underlying table that drives the output. If you turn ods trace on
, you can see that the table's name is called output
. We can select this and output it as a table named power
:
proc power;
twosamplefreq test=pchi
groupproportions = (0.16 0.11 )
sides=1
nullproportiondiff=0
alpha = 0.0249
power = 0.8 to 0.95 by 0.01
ntotal = .
;
ods output output=power;
run;