On Jun 9, 2013, at 7:41 AM, Ulrike Pasda wrote:
Dear all,
I have troubles figuring out how to convert missing values from Stata
(treated as -1 and -2) into NAs in R.
To read in the dta file I use: data - read.dta(data.dta)
Is there an option to tell R to convert the -1 and -2 into NAs ?
The documentation for read.dta in the foreign package suggests that true
Stata missingness is handled. (I also did not see an 'na.strings=' argument as
exists in read.table.) So perhaps you are not using Stata missing indicators
and have a private convention for missing. If that is the case then:
is.na(data$colA) - data$colA %in% c(-1, -2)
All this assumes many things which I cannot verify (whether that column is
numeric class for one). You should in further questions to Rhelp offer
dput(head(dorm)) where the `data` is is the name of the dataframe. Since `data`
is an R function (as is df) I would suggest that you use 'dfr'm for
data.frames. (That is not the cause of any problems but will be confusing to
readers of your code.)
--
David Winsemius
Alameda, CA, USA
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