Proc power for multiple group sample size calculation

[docfermi]

I am interested in a disease prevalence in each group (total 4 groups).  To determine statistical differences in proportions among these groups, I would like to know how many people I need in each group.  Can I use "proc power multreg", Or proc power twosamplefreq (Bonferroni correction, alpha=0.0083).  If I use proc power twosamplefreq, do I need to set three different odds ratio in reference to control and alpha adjustment (0.0083) with Bonferroni correction (6 comparison, alpha 0.05/6=0.0083).  Thank you.

proc power;

multreg

model = fixed

nfullpredictors = xx

ntestpredictors = 3

rsquarefull = xx

rsquarediff = xx

ntotal = .

power = 0.8;

run;

proc power;

two samplefreq test=lrchi

oddratio=1.5 2 2.5

ref proportion=0.5

npergroup=.

alpha=0.05 0.0083

power=0.8;

run;

[HB]

See if this is helpful:

https://communities.sas.com/t5/SAS-Statistical-Procedures/Sample-size-calculation-for-three-groups/m...