On 2010-03-30 2:41, pgseye wrote:
Thanks for the replies.
In response to Erik:
What does
Both[,1]
show you?
Both[,1]
[1] 3.36 NA NA NA NA NA NA 3.92 3.50 NA NA NA NA 3.76
3.19 3.83 NA 3.66..........
What does
Both[,1]> 2.5
show you?
Both[,1]>2.5
[1] TRUE NA NA NA NA NA NA TRUE TRUE NA NA
NA NA TRUE TRUE........
I understand a logical variable is binary, but don't know how to select a
subset of the data (have tried the subset function, but can't seem to get it
to work)
Bill, when I run what you suggested, I get:
tBoth<- Both
is.na(tBoth[tBoth> 2.5])<- TRUE
Error in is.na(tBoth[tBoth> 2.5])<- TRUE :
NAs are not allowed in subscripted assignments
R<- cor(tBoth, use = "complete.obs")
R[1,2]
[1] 0.7750889
Any idea with the error message?
This happens because your 'Both' already has missing values.
You can replace the line
is.na(tBoth[tBoth > 2.5]) <- TRUE
with
tBoth[tBoth > 2.5] <- NA
and the rest should work.
Thanks again,
Paul
--
Peter Ehlers
University of Calgary
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