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" <[EMAIL PROTECTED]> 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 [EMAIL PROTECTED] ______________________________________________ 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.
