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On 9/26/07, Lina Jonsson <email@example.com> wrote:
> Dear statalister.
> Sorry I haven´t had time to follow up my question until now.
> The memory problem occurs only when using the command for creating the spatial weight matrix (spatwmat). The dataset I´m using consists of only 28 variables - all numerical and dummies (0,1). According to an earlier question concering memory problems when using the spatwmat-command; "-spatwmat- will reset the number of observations to (N/2)*N-1" which means about 320 000 if I´m using a dataset with 800 observations. The advice that is given in the former question is to set memory to a higher value. That is the advice that also is given for my error message "no room to add more variables". But the problem is that I cannot set memory to more then 940m.
> I am using Windows XP and have just increased my RAM-memory to 2 GB which had no effect at all on the maximum memory I can set within Stata. As I understand it; the hotfix Michel mentioned is only for Stata 10 and I`m using Intercooled Stata 9.2.
> Is anyone having any suggestions on how this problem can be solved or is it not possible to use the spatwmat-command on datasets with 800 observation using "a normal computer". In fact I whould like to use up to 1738 observations but for that I whould need to switch to Stata SE instead of Intercooled Stata due to the fact that Intercooled Stata can set matsize to a maximum of 800. But there is no point in changing to Stata SE if the available memory sets the limit to less than 800 observations...
> If Stata can´t handle spatial weight matrices for large datasets, do any of you have any suggestions of other statistical software that can?
> Best regards.
> /Lina Jonsson
> > Från: firstname.lastname@example.org
> > [mailto:email@example.com] För Michael Blasnik
> > Skickat: den 21 september 2007 14:49
> > Till: firstname.lastname@example.org
> > Ämne: st: Re: Memory problems when creating a spatial weight matrix
> > You need to give us more information about your dataset,
> > operating system, etc.
> > The 940m should be plenty of room for a 500 observation
> > dataset and an 800x800 matrix. Can you describe your dataset
> > in more detail? Do you have hundreds of long string
> > variables? Is there a way for you to encode any long strings
> > and compress other variables? In terms of accessing more
> > memory -- what OS are you using? If MS Windows XP, have you
> > tried the memory hotfix described here
> > http://www.stata.com/support/faqs/win/winmemory.html?
> > Michael Blasnik
> > ----- Original Message -----
> > From: "Lina Jonsson" <email@example.com>
> > To: <firstname.lastname@example.org>
> > Sent: Friday, September 21, 2007 5:25 AM
> > Subject: st: Memory problems when creating a spatial weight matrix
> > > Dear statalisters.
> > >
> > > I am working with a hedonic price study where I whould like
> > to check for
> > > and correct for spatial autocorrelation. For this I whould like to
> > > create a spatial weight matrix based on the x- and y-coordinates for
> > > each house using the spatwmat-command in spdep. Since I
> > have Intercooled
> > > Stata the maximum matsize that I can set is 800, which
> > means that I can
> > > use no more than 800 observations. But since I cannot set
> > memory to more
> > > than 940m, the actual numbers of observations that I can use is less
> > > than 500. This is to few.
> > >
> > > After reading some old questions concerning memory problems
> > I realize
> > > that this might be a problem that is hard to solve.
> > > Does any of you have any suggestions on how I can increase
> > the memory in
> > > Stata. Can increasing the RAM-memory on my computer help? Or is it
> > > unrealistic to think that it will be possible to create a
> > matrix whith
> > > the spatwmat-command that will be almost 8000x800 on a "standard"
> > > computer? Should I change to some other software and what
> > in that case?
> > >
> > > I am greatful for any suggestions!
> > >
> > > /Lina Jonsson
> > *
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