I meant: calculates the means of variables 4 and 5 based on the levels of variable 1. Is that what you want?
On 11/29/06, Gabor Grothendieck <[EMAIL PROTECTED]> wrote: > 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: [email protected] > > >>> Subject: [R] Aggregating data > > >>> > > >>>> ______________________________________________ > > >>>> [email protected] 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] > > >>> > > >> ______________________________________________ > > >> [email protected] 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. > > >> > > > > > > > ______________________________________________ > > [email protected] 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. > > > ______________________________________________ [email protected] 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.
