I believe this needs to be posted on general statistical help list like stats.stackexchange.com as you appear to have some confusion about how linear regression works, especially with categorical variables.
?ordered might help you with R's way of dealing with the issues that I believe you're asking about, but it may not make much sense if I'm correct about your underlying misunderstanding. If I'm wrong, that and perhaps ?C will probably do it for you. -- Bert On Thu, Dec 15, 2011 at 1:44 PM, Abraham Mathew <abra...@thisorthat.com> wrote: > I'm running a linear model in R using the car package. > > I have a variable education, which i have recoded and regrouped to my > wishes. > However, R seems to place each element of that variable in alphabetical > order. > > When I am running the model, don't I need the model order from lowest to > highest to make an inference that > a one unit change in one variable produced a one unit change in another. > > levels(educ) > educ2 = NA > educ2[educ %in% levels(educ)[c(4,7)]] <- "HS or Some College" > educ2[educ %in% levels(educ)[1:2]] <- "College Degree" > educ2[educ %in% levels(educ)[c(3,5)]] <- "Advanced Degree" > educ2[educ %in% levels(educ)[c(6,8)]] <- "Other" > educ2 = factor(educ2) > levels(educ2) > > The above code is how I regrouped the variable. How can I regroup it so > that it's levels > are from lowest to highest. What if they're numeric values" > > -- > *Abraham Mathew > Statistical Analyst > This or That Media, Inc. > abra...@thisorthat.com > 720-648-0108 > @abmathewks > www.amathew.com > * > > [[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. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ 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.
