Dear R community: I am working on a model frame problem which is important for my data analysis. What I am trying to get is to get data set d3 through the model formula "ff=y~a+b+a*b" and data set d1 to generate a new data set d3 which includes a interaction column between a and b rather than d2. I have tried several ways but did not get that done. I would greatly appreciate any help. The codes are listed as follows:
Jixiang Wu #################################################### a=c(1:10) b=c(1:10) ab=paste(a,b,sep="*") d1=data.frame(y=rnorm(10),a=a,b=b) ff=y~a+b+a*b d2=model.frame(ff,d1) ## this generate from model.frame d2 d3=data.frame(y=rnorm(10),a=a,b=b,ab=ab) ## this is what I need d3 -- View this message in context: http://r.789695.n4.nabble.com/model-frame-problem-tp3948602p3948602.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org 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.
