Displaying 1 result from an estimated 1 matches for "treatment_stat".
2011 Apr 16
0
Question abt power calculation in multistrata data using Hmisc or other package
...months to death. In order to
calculate the statistical power necessary for carrying out this
analysis, i tried to find appropriate function in Hmisc package. But it
seems that it is meant for two groups such as reference/control versus
cases.
This is the sample of data in each of the two groups:
Treatment_stat Death MonthsToEvent
1 0 60.0
2 1 55.3
0 1 36.7
0 1 39.9
number of cases in treatment strata :
group 1: n12=110; n11=25;n10=15 (N2=150)
group 2: n22=43;n21=8;n20=9 (N2=60)
Coxph
output indicates significant different survival in group 1 data but not
in group 2. How can one be sure that the lack...