Kate -
As the error message indicates, num.strata is a
factor. This can occur when you're reading in data
and R encounters a non-numeric value which was not
specified in the na.strings= argument to read.table.
To do what you want, you'll need to convert it to a
character variable first:
myvar = factor(c(NA,NA,NA,'1'))
myvar[is.na(myvar)] = 0
Warning message:
In `[<-.factor`(`*tmp*`, is.na(myvar), value = 0) :
invalid factor level, NAs generated
myvar = as.character(myvar)
myvar[is.na(myvar)] = 0
myvar
[1] "0" "0" "0" "1"
If you want the variable to be treated as a numeric
variable, you can use as.numeric:
as.numeric(myvar)
[1] 0 0 0 1
Hope this helps.
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
[email protected]
On Tue, 9 Nov 2010, Kate Hsu wrote:
Dear r-users,
Basically, I have a data as follows,
data
S s1 s2 s3 s4 s5 prob obs num.strata
1 NNNNN N N N N N 0.0000108 32 <NA>
2 NNNNY N N N N Y 0.0005292 16 <NA>
3 NNNYN N N N Y N 0.0005292 24 <NA>
4 NNNYY N N N Y Y 0.0259308 8 1
....
I want to replace <NA> by 0, when I tried the following command, I get som
error message.
data[is.na(data)]<-0
Warning message:
In `[<-.factor`(`*tmp*`, thisvar, value = 0) :
invalid factor level, NAs generated
Anyone knows how to deal with this?
Thanks,
Kate
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