Re: [R] What's a labelled data.frame? And how do I work with it?

From: John Kane <jrkrideau_at_yahoo.ca>
Date: Wed 02 Aug 2006 - 05:48:27 EST

> I imported an SPSS file with its data labels using
> spss.get (Library(Hmisc).
> Class = data.frame
>
> I then updated some of the spss labels and added a
> label to the object itself.
>
> label (staff.allocation) <- "raw data from the spss
> file"
>
> I then save it as an R object. When I load the
> object
> for further work it comes in as Class = "labelled"
> "data.frame"
>
>
> Then I try this
>
>



> # Get the raw data that we have imported from SPSS.
> load("H:/R.objects/staff.allocation.Rdata")
>
> # Recode all 99's in the data base as NA except
> dates
> and Subject since subject
> # 99 is a valid ID number.
>
> # Drop dates and ids
> st1 <- staff.allocation[, -1:-4]
>
> st1[st1==99] <- NA
>
> #replace date and id forget the entry date
> st2 <-data.frame(staff.allocation$site,
> staff.allocation$subject,
> staff.allocation$date, st1)
>
>


> If I have applied a label to the data.frame I get an
> error
> Error in data.frame(staff.allocation$site,
> staff.allocation$subject, staff.allocation$date, :
>
> arguments imply differing number of rows: 1865,
> 114
>
> I orgininally was getting an error about
> " staff.allocation$site is a labelled
> class and cannot be coerced into a data.frame"
>
> but I lost that one while trying to see what was
> happeing
>
> If I do not apply the label to staff.allocation then
> I
> get a Class = "data.frame and I have no problem
> creating the second data.frame.
>
> Can anyone suggest what I am missing or what is
> happening
>
> Thanks

To follow up to my own post it appears that if I make any changes in the imported labels I also get an error message when I attempt to create that data.frame The message is
Error in as.data.frame.default(x[[i]], optional = TRUE) : cannot coerce class "labelled" into a data.frame



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