[R] Loop problem

[Hathaikan Chootrakool]

Dear everyone

     I am a new user,would like to combine these code together by using a
loop,each function has three value as Tr = 1 - 3,how can i combine
together?


logitTr1 <-logit[logit[,"Study"]&logit[,"Tr"]==1,]
(number of row in each group (1-3) is difference but equal in colume)

fnTr1 <- function (p) sum(
n/2*log(2*pi)+log(1/logitTr1$sd)+1/2*(logitTr1$logitp*logitTr1$logitp-2*logitTr1$logitp*p+p^2)
                    *1/logitTr1$sd*logitTr1$sd )
(maximum likelyhood function)

outTr1<- nlm (fnTr1,p=c(10),hessian=TRUE)
minimumTr1 <- outTr1$minimum
valueTr1 <- outTr1$estimate
(estimate the value)

The problem is the program couldn't work by using logitTr[i],fnTr[i]
outTr[i],minimumTr[i],value[i] in a loop. The function logitTr[i] is the
data matrix which is not equal each group, fnTr[i] is the
maximumlikelyhood function for estimation in next step;
outTr[i],minimumTr[i],valueTr[i].



Has anyone got any idea to help me?,thank you very much.

Hathaikan