[R] Variable and value labels

[Anupam Tyagi]

Very interesting! Thanks!

On Wed, 12 Jul, 2023, 7:58 pm Viechtbauer, Wolfgang (NP), <
wolfgang.viechtbauer using maastrichtuniversity.nl> wrote:

> For value labels, factor() provides the necessary machinery. For variable
> labels, one could make use of comment() (something that not too many people
> seem to know about). To illustrate:
>
> # look at the mtcars dataset
> mtcars
>
> # turn 'am' into a factor and use labels for the two possible levels
> thereof
> mtcars$am <- factor(mtcars$am, levels=c(0,1),
> labels=c("automatic","manual"))
> mtcars
>
> # add a variable label via comment()
> comment(mtcars$am) <- "Type of transmission"
>
> # extract all the variable labels
> sapply(mtcars, comment)
>
> Best,
> Wolfgang
>
> >-----Original Message-----
> >From: R-help [mailto:r-help-bounces using r-project.org] On Behalf Of Anupam
> Tyagi
> >Sent: Wednesday, 12 July, 2023 14:11
> >To: Martin Maechler
> >Cc: r-help mailing list
> >Subject: Re: [R] Variable and value labels
> >
> >Thanks. Sorry, I have not consulted help pages, but did a web search. Web
> >search results are referring to some package or the other for doing
> labels.
> >Thanks for letting me know that this can be done in base-R. I will try to
> >find the relevant information in R documentation.
> >
> >On Wed, 12 Jul, 2023, 1:33 pm Martin Maechler, <
> maechler using stat.math.ethz.ch>
> >wrote:
> >
> >> >>>>> Anupam Tyagi
> >> >>>>>     on Wed, 12 Jul 2023 09:18:55 +0530 writes:
> >>
> >>     > Hello,
> >>
> >>     > is there an easy way to do variable and value labels (for
> >>     > factor variables) in base-R, without using a package.
> >>
> >> Yes, there are many.
> >> How many help pages (in R , i.e. base-R)  did you consult?
> >>
> >> Very general questions as the above are not very useful,
> >> because typically the only concised answer can be yes/no.
> >>
> >>
> >>     > If not, what is an easy and good way to do labels, using an
> >>     > add-on package.
> >>
> >>
> >>     > --
> >>     > Anupam.
>

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