1. Some data structured the way you are using would have been helpful.
I used Tal Galil's play data and set up a dataframe with the variable names you
are using:
structure(list(var1 = c(1, NA, NA, 4, 5, 6, 7, 8, 9, 10, 5),
var2 = c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 5)), .Names = c("var1",
"var2"), row.names = c(NA, -11L), class = "data.frame")
> myData
var1 var2
1 1 1
2 NA 2
3 NA 3
4 4 4
5 5 5
6 6 6
7 7 7
8 8 8
9 9 9
10 10 10
11 5 5
2. The error message I get from your line of code is
> myData[myData$var1==5;"var1"]<-NA
Error: unexpected ';' in "myData[myData$var1==5;"
Probably the semikolon is a typo?
3. If I understand your question correctly, the easiest answer I can find is
ifelse():
> myData$var1 <- ifelse( myData$var1 == 5, NA, myData$var1 )
> myData
var1 var2
1 1 1
2 NA 2
3 NA 3
4 4 4
5 NA 5
6 6 6
7 7 7
8 8 8
9 9 9
10 10 10
11 NA 5
Rgds,
Rainer
On Thursday 12 April 2012 11:08:45 David Studer wrote:
> Hello everybody,
>
> I know this is pretty basic stuff, but could anyone explain me how to
> recode a single value of a variable
> into a missing value?
>
> I used to do it like this:
>
> myData[myData$var1==5;"var1"]<-NA # recode value "5" into "NA"
>
> But the column "var1" already contains NAs, which
> results in the following error message:
>
> "missing values are not allowed in subscripted assignments of data frames"
>
> Thank you very much for any advice!
>
> David
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
