Hello,
I am trying to do an interim analysis using the o'brien-flemming method. I found these codes. However I do not know how to edit to input my own data. This seems like a macro. My data includes ID numbers, treatment group, result before and after treatment.
Thank you.
proc seqdesign altref=0.4
pss
stopprob
errspend
;
TwoSidedPocock: design nstages=4 method=poc;
TwoSidedOBrienFleming: design nstages=4 method=obf;
samplesize model=twosamplemean(stddev=0.8 weight=2);
run;