Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
From | ABDUL ADAM <bihiabdul@yahoo.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: autocorrelation test returning 'invalid subcommand dwatson' |
Date | Thu, 19 May 2011 02:23:41 -0700 (PDT) |
Thank you very much Nick for your reply. I am estimating a system of expenditure share equations (14 equations altogether). I am using a weekly time series data, and since one usually suspects that there could be serial correlation of the error terms in such data, I wanted to see whether this is true in my case by using D-W test on the nlsur residuals. Moreover, I have already tsset my data (before the estimation). I am not sure, though, if I understand what you mean "calculate explicitly". More explanations or other tips are highly appreciated. Abdul --- On Thu, 5/19/11, Nick Cox <njcoxstata@gmail.com> wrote: > From: Nick Cox <njcoxstata@gmail.com> > Subject: Re: st: autocorrelation test returning 'invalid subcommand dwatson' > To: statalist@hsphsun2.harvard.edu > Date: Thursday, May 19, 2011, 1:50 AM > Yes, but which -estat- subcommands > are supported depends on the > estimation command previously run and those subcommands are > not > supported in this case. > > Evidently you have a system of equations that you are > estimating with > -nlsur-. What precisely were you expecting e.g. the > Durbin-Watson > command to work on? This is not my field -- and this is the > limit of > my advice -- but I suspect you would need to calculate that > explicitly > and also declare your data to be time series. > > Nick > > On Thu, May 19, 2011 at 9:38 AM, ABDUL ADAM <bihiabdul@yahoo.com> > wrote: > > Dear Members, > > I have run an nlsur programme and after the estimation > tried to do an autocorrelation test. I used both estat > dwatson, estat dwstat, estat bgodfrey. In each case I get > error r(321) 'invalid subcommand'. I know from the Stata > reference manual that estat is one the postestimation > commands that are available for nlsur. I am using version > 10.0. Any idea of what I could do to proceed with my > autocorrelation test? > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/