[R] resampling problem counting number of means above a specific value

[David Winsemius]

On Nov 15, 2009, at 12:12 PM, Graham Smith wrote:

> I am trying to modify some code from Good 2005.
>
> I am trying  to resample the mean of 8 values and then count how many
> times the resampled mean is greater than 10. But my count of means
> above 10 is coming out as zero, which I know isn't correct.

If that is your goal, then why are you using "<=" and not ">" in your  
test?

 > for(i in 1:N){
+  LLb <- sample (LL, n, replace=TRUE)
+  if (mean(LLb) > threshold) cnt<-cnt+1
+  }
 > cnt
[1] 1000
>

> I would appreciate it if someone could look at the code below and tell
> me what I am doing wrong.
>
> Many thanks,
>
> Graham
>
>> LL<- c(12.5,17,12,11.5,9.5,15.5,16,14)
>> N<-1000
>> n<-length(LL)
>> threshold<-10
>> cnt<-0
>> for(i in 1:N){
> + LLb <- sample (LL, n, replace=TRUE)
> + if (mean(LLb)<=threshold) cnt<-cnt+1
> + }
>> cnt
> [1] 0
>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT