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From |
"Lina Jonsson" <lina.jonsson@vti.se> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: SV: Re: Memory problems when creating a spatial weight matrix |

Date |
Wed, 26 Sep 2007 12:06:27 +0200 |

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: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu] För Michael Blasnik > Skickat: den 21 september 2007 14:49 > Till: statalist@hsphsun2.harvard.edu > 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" <lina.jonsson@vti.se> > To: <statalist@hsphsun2.harvard.edu> > 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 > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**st: Re: SV: Re: Memory problems when creating a spatial weight matrix***From:*"Michael Blasnik" <michael.blasnik@verizon.net>

**Re: st: SV: Re: Memory problems when creating a spatial weight matrix***From:*"Sergiy Radyakin" <serjradyakin@gmail.com>

**References**:**st: bug in ivtobit***From:*"David Roodman (DRoodman@cgdev.org)" <DRoodman@CGDEV.ORG>

**st: Memory problems when creating a spatial weight matrix***From:*"Lina Jonsson" <lina.jonsson@vti.se>

**st: Re: Memory problems when creating a spatial weight matrix***From:*"Michael Blasnik" <michael.blasnik@verizon.net>

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