Re: [R] GLS "no terms component" error

From: <Bill.Venables_at_csiro.au>
Date: Sun, 27 Jul 2008 14:39:29 +1000

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

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-----Original Message-----
From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-project.org] On Behalf Of mm745_at_st-andrews.ac.uk
Sent: Sunday, 27 July 2008 6:26 AM
To: r-help_at_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


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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. Received on Sun 27 Jul 2008 - 04:42:05 GMT

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