> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On > Behalf Of whitaker m. (mw1006) > Sent: Wednesday, December 16, 2009 2:14 PM > To: Nikhil Kaza; Petr PIKAL > Cc: r-help@r-project.org > Subject: Re: [R] Odp: Creating Dummy Variables in R > > I have a much larger dataset than in my original email (attached - price > dependent > upon weight, Clarity (different levels IF-SI2), colour(levels D-L) and Cut > (ideal-fair), > and tried the regression command: > > >diamond.lm<- > lm(price~weight+IF+VVS1+VVS2+VS1+VS2+SI1+SI2+I1+I2+D+E+F+G+H+I+J+K > +L+ideal+excellent+very.good+good+fair, data="Diamonds2.txt") > > Error in eval(predvars, data, env) : invalid 'envir' argument > > Which lead to the error message below the command. I have tried searching for > this, and assumed this was down to having categrocial variables within the > data, is > this a correct assumption or am i doing something else wrong? Apologies if > this is a > bit of a basic question! > > Thanks again, > Matthew
You need to read your data from Diamonds2.txt into a dataframe first before running the lm() function. What does your file Diamonds2.txt look like? Dan Daniel J. Nordlund Washington State Department of Social and Health Services Planning, Performance, and Accountability Research and Data Analysis Division Olympia, WA 98504-5204 ______________________________________________ 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.
