Hello, I am trying to automate linear regression for many different datasets, each with the same rough format (the last variable is the response). I've been doing something like this: lm=lm(x[,dim(x)[2]] ~ ., data=x) where the dot denotes all variables. However, this means that the response is included as a predictor, which is obviously what I don't want. How do I request that all the columns in my dataset be used as predictors, except for the response? Thanks, Walter [[alternative HTML version deleted]]
What about using x[,-predictor]. For instance: x <- matrix(1:9, nrow=3) x[,-2] # all but the second column Perhaps using your code it would be something like... lm=lm(x[,dim(x)[2]] ~ x[,-dim(x)[2]], data=x) Best regards, Josh On Tue, Apr 20, 2010 at 3:12 PM, Walter Yund IV <wyundiv at gmail.com> wrote:> Hello, > > I am trying to automate linear regression for many different datasets, each > with the same rough format (the last variable is the response). ?I've been > doing something like this: > > ?lm=lm(x[,dim(x)[2]] ~ ., data=x) > > where the dot denotes all variables. ?However, this means that the response > is included as a predictor, which is obviously what I don't want. ?How do I > request that all the columns in my dataset be used as predictors, except for > the response? > > Thanks, > > Walter > > ? ? ? ?[[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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. >-- Joshua Wiley Senior in Psychology University of California, Riverside http://www.joshuawiley.com/
lm can take a data frame whose first column is the response so: lm(rev(x)) On Tue, Apr 20, 2010 at 6:12 PM, Walter Yund IV <wyundiv at gmail.com> wrote:> Hello, > > I am trying to automate linear regression for many different datasets, each > with the same rough format (the last variable is the response). ?I've been > doing something like this: > > ?lm=lm(x[,dim(x)[2]] ~ ., data=x) > > where the dot denotes all variables. ?However, this means that the response > is included as a predictor, which is obviously what I don't want. ?How do I > request that all the columns in my dataset be used as predictors, except for > the response? > > Thanks, > > Walter > > ? ? ? ?[[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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. >