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AW: st: RE: Error Message: r3900 - Problem with Memory of my Computer system ?!
From
"Martin Weiss" <[email protected]>
To
<[email protected]>
Subject
AW: st: RE: Error Message: r3900 - Problem with Memory of my Computer system ?!
Date
Sun, 16 May 2010 18:22:46 +0200
<>
" Well, the if runiform()<.01 command causes a drop in observations. The
result is the uselessness of the regression results as the coefficients are
meaningless."
Sure, it was intended to give you a way to randomize the sample used to test
your procedure on 1% of your original sample - to see whether it does work.
It is not intended to yield results fit for publication. For that, you do
need more memory/64-bit.
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Pascal Stock
Gesendet: Sonntag, 16. Mai 2010 18:15
An: [email protected]
Betreff: RE: st: RE: Error Message: r3900 - Problem with Memory of my
Computer system ?!
Well, the if runiform()<.01 command causes a drop in observations. The
result is the uselessness of the regression results as the coefficients are
meaningless. Hence I looked for a manual adjustment to the
heteroscedasticity in the Heckman two-step probit selection model to obtain
efficient standard errors. A literature says that bootstrapping is a
solution to be used for the selection and structural equation. Hence I will
see if this works and if I can get STATA 11 from the Graduate School.
Kind regards and enjoy your Sunday
Pascal
____________________________________________
Pascal Stock
Quadrat N4, 8-9
68131 Mannheim
Germany
Phone: +49 (0) 621 - 16753 - 80
Fax: +49 (0) 621 - 16753 - 81
Mobile phone: +49 (0) 178 - 4981887
Email: [email protected]
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Martin Weiss
Sent: Sonntag, 16. Mai 2010 13:31
To: [email protected]
Subject: RE: st: RE: Error Message: r3900 - Problem with Memory of my
Computer system ?!
<>
To implement Kit`s proposal, Pascal could qualify his -cmp- call via
***********
if runiform()<.01
***********
Since he said he has 10.1, this should work.
HTH
Martin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Kit Baum
Sent: Sonntag, 16. Mai 2010 13:29
To: [email protected]
Subject: re:st: RE: Error Message: r3900 - Problem with Memory of my
Computer system ?!
<>
Pascal said
Martin gave me the extremely helpful advice to use the "cmp" command to
implement a three-stage selection model. So far it works fine. However, when
modeling the three-stage system with two selection equations and 1,000,000
observations I get the following error message when cmp tries to estimate
the combined model:
<istmt>: 3900 unable to allocate real <tmp>[1224521,46]
r(3900);
I already allocated the maximum memory (1000m) and matsize (10,000) to
STATA. I still get this error message.
So you have an idea how to solve the memory problem?
By my calculations that single matrix is about 4.2 Gb, so unless you have
access to a system where you can allocate
5 or 6 Gb to Stata, you have no hope of solving this problem. What happens
if you try to estimate the model with
10000 observations rather than a million?
Kit Baum | Boston College Economics & DIW Berlin |
http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming |
http://www.stata-press.com/books/isp.html
An Introduction to Modern Econometrics Using Stata |
http://www.stata-press.com/books/imeus.html
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