Re: st: do variables not used in a process take up memory while a process runs?

[Hitesh Chandwani <chandwanihitesh@mail.utexas.edu>]

I am a new user to Stata, but as far as I know, Stata is very RAM- 
heavy. Thus, using a USB stick will not help as it doesn't add to the  
RAM available. Try -set mem 2g- and see what happens. If you are using  
Stata default settings, then the memory might be an issue.


---------------------------------------------------
Hitesh S. Chandwani
Graduate Student,
Division of Pharmacy Administration,
University of Texas at Austin.
Cell: 512-461-4328



On May 4, 2011, at 10:03 AM, Doug Hess wrote:

> I'm running models with 30 predictors on 150,00 records using
> xtmelogit to examine random intercepts. As you can imagine this takes
> a long time to run. I started a model last Thursday night (US east
> coast)  and it didn't produce results until Queen Elizabeth II stepped
> into Westminster Abbey Friday morning (perhaps propitious for my
> research depending on your belief in the divine right of monarchs, but
> it was nine hours after Stata started the process).
>
> So, I'm looking for any tricks to speed things up (using Stata 11/IC
> on a Windows 7 PC with 2.66 ghz Intel and 2.96gb RAM usable). I tried
> the Laplacian option but it didn't seem to speed things up and I'm not
> sure if the estimates are considered reliable, so to speak, if you use
> that option.
>
> One question: I first -keep- only the variables in the model, does
> this speed things up? I.e., is Stata turning around in its head all
> the data in the database, or just those that are in the model as it
> runs the process?
>
> Second question: if I use a USB memory stick to "readyboost" the
> memory, does this help speed Stata up for such processes?
>
> I'm open to other thoughts. Or I am I better off dumping the results
> into other specialized software for hierarchical modeling? (No offense
> to Stata.)
>
> Thank you.
>
> Doug
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