Using the builtin data set CO2: aggregate(CO2[4:5], CO2[1], mean)
calculates the means of variables 4 and 5 based combinations of the levels of variable 1. Is that what you want? On 11/29/06, David Kaplan <[EMAIL PROTECTED]> wrote: > Chuck and others. Here is the problem I need help on. Thanks. > > -------------------- > > I want to follow-up on a question I had a week or so ago. I want to > aggregate a very large data set. Generally in a program such as SPSS, > one chooses a so-called "break variable" that is the variable, and then > the remaining variables are aggregated by that variable with some > summary statistic calculated - such as the mean. > > I played with "aggregate" in R and found that it requires a "by" > statement listing the variables. But I don't see how I can aggregate on > one variable and create the summary statistics on the remaining > variables. I hope that was clear. Thanks for an advice in advance. > > David > =========================================================================== > David Kaplan, Ph.D. > Professor > Department of Educational Psychology > University of Wisconsin - Madison > Educational Sciences, Room, 1061 > 1025 W. Johnson Street > Madison, WI 53706 > > email: [EMAIL PROTECTED] > homepage: http://www.education.wisc.edu/edpsych/facstaff/kaplan/kaplan.htm > Phone: 608-262-0836 > =========================================================================== > > Chuck Cleland wrote: > > David Kaplan wrote: > >> The problem is that this doesn't seem to give what I want. I did look > >> at this. Perhaps doBy will work - haven't tried it yet. But, any other > >> suggestions are much appreciated. > > > > David: > > Your posts on aggregating came to the list without any text in the > > body of the message (I believe Petr sent a response based only on the > > subject). You might get more specific and helpful suggestions if you > > send a small example of what you are trying to do and why aggregate() > > does not work for you. Also, be sure to send messages in plain text > > rather than HTML. > > > > hope this helps, > > > > Chuck Cleland > > > >> =========================================================================== > >> David Kaplan, Ph.D. > >> Professor > >> Department of Educational Psychology > >> University of Wisconsin - Madison > >> Educational Sciences, Room, 1061 > >> 1025 W. Johnson Street > >> Madison, WI 53706 > >> > >> email: [EMAIL PROTECTED] > >> homepage: http://www.education.wisc.edu/edpsych/facstaff/kaplan/kaplan.htm > >> Phone: 608-262-0836 > >> =========================================================================== > >> > >> Petr Pikal wrote: > >>> Similar answer as last time > >>> > >>> aggregate, tapply, by or ppackage doBy > >>> > >>> HTH > >>> > >>> PS. If you want to add some other text then subject in your post do > >>> not use HTML posting as recommended in posting guide. > >>> > >>> Petr > >>> > >>> > >>> On 28 Nov 2006 at 22:04, David Kaplan wrote: > >>> > >>> Date sent: Tue, 28 Nov 2006 22:04:09 -0600 > >>> From: David Kaplan <[EMAIL PROTECTED]> > >>> To: r-help@stat.math.ethz.ch > >>> Subject: [R] Aggregating data > >>> > >>>> ______________________________________________ > >>>> 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. > >> > > > > ______________________________________________ > 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. > ______________________________________________ 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.