Hi I agree with Dieter. I think you are probably looking for some aggregation function (aggregate, tapply, by,...), but it is only a guess.
Sometimes it help me to answer my questions myself before I actually post it to Rhelp when I try to elaborate an example using artificial simple data for others to understand what I am trying to do and how I fail. HTH Petr On 27 Apr 2006 at 6:20, Dieter Menne wrote: To: r-help@stat.math.ethz.ch From: Dieter Menne <[EMAIL PROTECTED]> Date sent: Thu, 27 Apr 2006 06:20:44 +0000 (UTC) Subject: Re: [R] help > Anamika Chaudhuri <canamika16 <at> yahoo.com> writes: > > > I was trying to calculate an age adjusted rate for which we have > > the > formula as > > sum(weight*rate)/sum(weight). I am using the framingham dataset > > called fram > here.I cant figure out how I > > could change the logical statement I have for the standard dataset > > (in red) > to calculate weight and > > calculating the wevents and atrisk(in red) > > ... lengthy code follows > > If you want to get an answer, provide as good subject line and a data > set (e.g. part of Framingham). Nobody loves to wade through so many > lines of code without the chance to check out what is intended. > > Dieter > > ______________________________________________ > 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 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
