[R] Auto Data in the ISLR Package

[Eric Berger]

Hi Peter,
I looked at the Auto data frame and tested before I sent my reply. The
entries in the "name" column are actually models, such as

> head(Auto$name)
[1] chevrolet chevelle malibu buick skylark 320         plymouth satellite
      amc rebel sst
[5] ford torino               ford galaxie 500

What you are suggesting won't work. I agree with your "bedford" example as
a problem, but given the size of the result set in this case (~73 rows)
it's easy to eyeball the results and see if they're ok.

Regards,
Eric


On Sun, Dec 17, 2017 at 11:00 AM, peter dalgaard <pdalgd at gmail.com> wrote:

> That probably works in this case, but it would cause grief if another car
> make had "ford" somewhere inside its name e.g. "bedford". Safer general
> practice is
>
> Auto[Auto$name %in% c("ford", "toyota"),]
>
> or similar using subset().
>
> -pd
>
> > On 17 Dec 2017, at 09:10 , Eric Berger <ericjberger at gmail.com> wrote:
> >
> > myAuto <- Auto[ grep("ford|toyota",Auto$name),]
> >
> >
> >
> > On Sat, Dec 16, 2017 at 10:28 PM, Bert Gunter <bgunter.4567 at gmail.com>
> > wrote:
> >
> >> I did not care to load the packages -- small reproducible examples are
> >> preferable, as the posting guide suggests.
> >>
> >> But, if I have understood correctly:
> >>
> >> See, e.g. ?subset
> >>
> >> Alternatively, you can read up on indexing data frames in any good
> basic R
> >> tutorial.
> >>
> >> Cheers,
> >> Bert
> >>
> >> Bert Gunter
> >>
> >> "The trouble with having an open mind is that people keep coming along
> and
> >> sticking things into it."
> >> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
> >>
> >> On Sat, Dec 16, 2017 at 11:44 AM, AbouEl-Makarim Aboueissa <
> >> abouelmakarim1962 at gmail.com> wrote:
> >>
> >>> Dear All:
> >>>
> >>> I would like to create a subset data set *with only* all Ford and all
> >>> Toyota cars from the Auto data set  in ISLR R Package.  Thank you very
> >> much
> >>> in advance.
> >>>
> >>> Please use the following code to see how is the data look like.
> >>>
> >>>
> >>> install.packages("ISLR")
> >>> library(ISLR)
> >>> data(Auto)
> >>> head(Auto)
> >>>
> >>>
> >>> with many thanks
> >>> abou
> >>> ______________________
> >>>
> >>>
> >>> *AbouEl-Makarim Aboueissa, PhD*
> >>>
> >>> *Professor of Statistics*
> >>>
> >>> *Department of Mathematics and Statistics*
> >>> *University of Southern Maine*
> >>>
> >>>        [[alternative HTML version deleted]]
> >>>
> >>> ______________________________________________
> >>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> >>> 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.
> >>>
> >>
> >>        [[alternative HTML version deleted]]
> >>
> >> ______________________________________________
> >> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> >> 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.
> >>
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > 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.
>
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Office: A 4.23
> Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com
>
>
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