Denis,
> Are you perhaps thinking of conjoint analysis? > > Thanks, but as far as I can make out, having just looked at conjoint analysis, it looks like some form of discriminant analysis, which is not what I am looking for. I only have two variables cost and value. I am ignoring how you establish the value, I just need to be able to assess every possible combination of costs and value. Its common technique in the Decision Analysis literature (and specialist Decision Analysis software), but I have never seen it given a Specific name. But of course it may have several names, and be used across different disciplines for different purposes. Its such a common tool, that I was hoping that someone would instantly recognise, what I was describing, and be able to say that it was available in a particular package. But I had never looked at conjoint analysis before, so nice to know it exists. Graham [[alternative HTML version deleted]] ______________________________________________ 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.