Nothing
TwoSampleSurvival.Equivalence <-
function(alpha,beta,lam1,lam2,k,ttotal,taccrual,gamma,margin){
variance1<-lam1^2*(1+gamma*exp(-lam1*ttotal)*(1-exp((lam1-gamma)*taccrual))/((lam1-gamma)*(1-exp(-gamma*taccrual))))^-1
variance2<-lam2^2*(1+gamma*exp(-lam2*ttotal)*(1-exp((lam2-gamma)*taccrual))/((lam2-gamma)*(1-exp(-gamma*taccrual))))^-1
print(variance1)
print(variance2)
n2=(qnorm(1-alpha)+qnorm(1-beta/2))^2*(variance1/k+variance2)/(margin-abs(lam2-lam1))^2
n2
}
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