Thank you, Bill. I think I misread some text in my statistics handbook. This has helped to clear it up. Sorry for taking up your time and thank you for replying.
M. Grace Quoting [EMAIL PROTECTED]: > The help file for dwtest says > > formula: a symbolic description for the model to be tested (or a fitted > "lm" object). > > It is not clear from your message, but it would seem that you used fitp2 > as the argument to dwtest. (In any case, this gives the error message > you quote?) > > But fitp2 is neither a formula, nor is it an object ineriting from "lm". > > Why did you expect dwtest to work on a gls object? > > > Bill Venables > CSIRO Laboratories > PO Box 120, Cleveland, 4163 > AUSTRALIA > Office Phone (email preferred): +61 7 3826 7251 > Fax (if absolutely necessary): +61 7 3826 7304 > Mobile: +61 4 8819 4402 > Home Phone: +61 7 3286 7700 > mailto:[EMAIL PROTECTED] > http://www.cmis.csiro.au/bill.venables/ > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On Behalf Of [EMAIL PROTECTED] > Sent: Sunday, 27 July 2008 6:26 AM > To: r-help@r-project.org > Subject: [R] GLS "no terms component" error > > Hi, > > I want to test for independence in my GLS model fitp2, but when I try to > use the > dwtest function in the lmtest library, I get the error message "Error in > terms.default(formula) : no terms component". > > The model and data set are below. Any suggestions would be really > helpful! > Thanks a lot in advance, > > M. Grace > > > fitp2: > fitp2<-gls(V3_total~D_total+P_total,data=pdata,weights=varPower()) > > based on the data set pdata: > pdata > D_total V3_total P_total > 1 75 158000 302.033 > 2 221 258000 126.664 > 3 1050 280000 538.547 > 4 8100 208000 1090.068 > 5 22100 235000 2038.937 > 6 5300 570000 2626.226 > 7 3250 454000 2326.473 > 8 6540 169000 5613.525 > 9 5248 247000 6011.532 > 10 22484 542000 15140.006 > 11 30841 530000 13324.048 > 12 7480 497000 10481.812 > 13 2664 467000 5776.274 > 14 432 285000 1849.763 > > > ------------------------------------------------------------------ > University of St Andrews Webmail: https://webmail.st-andrews.ac.uk > > ______________________________________________ > 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. > > > ------------------------------------------------------------------ University of St Andrews Webmail: https://webmail.st-andrews.ac.uk ______________________________________________ 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.
