From: Sean O'Riordain <seanpor_at_acm.org>

Date: Fri 08 Sep 2006 - 11:05:44 GMT

R-help@stat.math.ethz.ch 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. Received on Fri Sep 08 21:12:37 2006

Date: Fri 08 Sep 2006 - 11:05:44 GMT

Hi Graham,

Try creating a new column with the two levels that you want...

something along the lines of (warning untested!!!)

and then do the

by(GQ1[,"Max"], list(GQ1$NewColumn), summary)

when in doubt... break the problem into smaller chunks... :-)

On 08/09/06, Graham Smith <myotisone@gmail.com> wrote:

> Petr,

*>
**> Thanks again, but the data is GQ1, Max is a variable (column)
**>
**> So I have used
**>
**> by(GQ1[,"Max"], list(GQ1$Status), summary)
**>
**> Which is very good, and is better than the way I did it before by
**> summarising for each status level individually, but that still isn't combing
**> the data for Status == "Expert" and Status = "Ecol"
**>
**> So at the moment the status variable has 3 levels Expert, Ecol and Stake,
**>
**> I want to analsye that at two levels: Expert and Ecol combined into a new
**> level called "AllEcol" and the exsiting level "Stake"
**>
**> It is this combining the levels that has got me stuck.
**>
**> Thanks again,
**>
**> Graham
**>
**> On 08/09/06, Petr Pikal <petr.pikal@precheza.cz> wrote:
**> >
**> > Sorry, I did not notice that in your case Max is not a function but
**> > your data. So probably
**> >
**> > by(Max[, your.columns], list(Max$status), summary)
**> >
**> > is maybe what you want.
**> > HTH
**> > Petr
**> >
**> >
**> > On 8 Sep 2006 at 10:31, Petr Pikal wrote:
**> >
**> > From: "Petr Pikal" <petr.pikal@precheza.cz>
**> > To: "Graham Smith" <myotisone@gmail.com>,
**> > r-help@stat.math.ethz.ch
**> > Date sent: Fri, 08 Sep 2006 10:31:12 +0200
**> > Priority: normal
**> > Subject: Re: [R] subsetting a data set
**> >
**> > > Hi
**> > >
**> > > I am not sure if your Max is the same as max so I am not sure what you
**> > > exactly want from your data. However you shall consult ?tapply, ?by,
**> > > ?aggregate and maybe also ?"[" together with chapter 2 in intro manual
**> > > in docs directory.
**> > >
**> > > aggregate(data[, some.columns], list(data$factor1, data$factor2), max)
**> > >
**> > > will give you maximum for specified columns based on spliting the data
**> > > according to both factors
**> > >
**> > > Also connection summary with max is not common and I wonder what is
**> > > your output in this case. I believe that there are six same numbers.
**> > > However R is case sensitive and maybe Max does something different
**> > > from max. In my case it throws an error.
**> > >
**> > > HTH
**> > > Petr
**> > >
**> > > On 8 Sep 2006 at 8:06, Graham Smith wrote:
**> > >
**> > > Date sent: Fri, 8 Sep 2006 08:06:16 +0100
**> > > From: "Graham Smith" <myotisone@gmail.com>
**> > > To: r-help@stat.math.ethz.ch
**> > > Subject: [R] subsetting a data set
**> > >
**> > > > I have a data set called GQ1, which has 20 variables one of which is
**> > > > a factor called Status at thre levels "Expert", "Ecol" and "Stake"
**> > > >
**> > > > I have managed to evaluate some of the data split by status using
**> > > > commands like:
**> > > >
**> > > > summary (Max[Status=="Ecol"])
**> > > >
**> > > > BUT how do I produce asummary for Ecol and Expert combined, the
**> > > > only example I can find suggsts I could use
**> > > >
**> > > > summary (Max[Status=="Ecol"& Status=="Expert"]) but that doesn't
**> > > > work.
**> > > >
**> > > > Additionally on the same vein, if I cannot work out how to create a
**> > > > new data set that would contain all the data for all the variables
**> > > > but only for the data where Status = Ecol, or where status equalles
**> > > > Ecol and Expert.
**> > > >
**> > > > I know this is yet again a very simple problem, but I really can't
**> > > > find the solution in the help or the books I have.
**> > > >
**> > > > Many thanks,
**> > > >
**> > > > Graham
**> > > >
**> > > > [[alternative HTML version deleted]]
**> > > >
**> > > > ______________________________________________
**> > > > R-help@stat.math.ethz.ch 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.
**> > >
**> > > Petr Pikal
**> > > petr.pikal@precheza.cz
**> > >
**> > > ______________________________________________
**> > > R-help@stat.math.ethz.ch 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.
**> >
**> > Petr Pikal
**> > petr.pikal@precheza.cz
**> >
**> >
**>
**> [[alternative HTML version deleted]]
**>
**> ______________________________________________
**> R-help@stat.math.ethz.ch 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.
**>
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