hie R users
   
  l have the following matrix
      n=20
      m<-matrix(nrow=n,ncol=4)
      colnames(m)=c("treatmentgrp","strata","survivalTime")                  
          for(i in 1:n) m[i,]<-c(sample(c(1,2),1,replace=TRUE),sample(c(1:2),1,replace=TRUE),rexp(1,0.07),rexp(1,0.02))                                                                  
   
      print(m)
    1.l would like to control the size of the treatment variable eg treatment 1=size 5 treatment 2=size 15.
  
  2. l would also want to control the size of the strata ie in treatment 1 divide the strata in to 2 etc.
  
  3. For the survival time l would like to have treatment 1-strata 1  using a different rate  from treatment 2 -strata 2 etc to generate  the survival time.
  
  the program l used above does nt do this so if you can help
  
  thanks 
  
       
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