[R] 'break' function in loop

[Duncan Murdoch]

On 12-03-01 8:24 AM, Tsai, Pei-Chien wrote:
> Dear R helpers,
>
> I have some difficulties in using 'break' function with loop, and the followings are my script. What I try to do is (1) permute 'or' first; (2) doing t-test if this 'or' pass criteria 1 (k=1); (3) end the loop when I get 10 permutations; (4) redo everything again but this time use criteria 2 (k=2) (I have more criteria 1:n).
>
> Somehow using my script, the final dataset (results1) only contains the result from criteria 1 (twice!) but not the result from criteria 2. I guess probably I put the break function under the wrong loop but I cannot fix it. Sorry if the whole script looks quite messy, I will be very appreciate if someone can help me fix this problem or probably give me some advices to write it in a smart way.
>
>
> My attempt:
>
> controlall<- rbeta(10000,1.5,6)
> caseall<- rbeta(10000,1.6,6)
>
> results<- NULL
> results1<- NULL
> or<-vector("list",length=10)
> criteria<- matrix(data=c(1.05,1.15,1.15,1.25),ncol=2,nrow=2)
>
> for (k in 1:2) {
>
> for (i in 1:1000)
>       {
>           control<- sample(controlall,100)
>           case<- sample(caseall,100)
>           or[i]<- round(mean(case)*(1-mean(control))/(mean(control)*(1-mean(case))),digit=2)
>
>   if (or[i]<criteria[k,2]&or[i]>=criteria[k,1])
>   {
>       group<- c(rep(1,100),rep(0,100))
>       value<- c(case,control)
>       ttest<- (t.test(case,control,alternative="two.sided",paired=F))$p.value
>       all<- c(or[i],ttest)
>       results<- rbind(results,all)
>   }
>           ifelse(nrow(results)==5,break,1)

Jim was right, this line doesn't make sense.  Use

if(nrow(results)==5) break

instead.

Duncan Murdoch

>   }
>      results1<- rbind(results1,results)
>   }
>
>
> Thank you so much in advance,
> Amber
>
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>
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