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st: RE: RE: changing number of observations for tempvars


From   "Ypma, Jelmer Yeb" <jelmer@rand.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: changing number of observations for tempvars
Date   Fri, 12 Nov 2004 15:52:45 -0800

Thanks, that's what I feared for. 

I want to simulate the cumulative density for a trivariate normal distributed set of variabes. This result should be used in my Maximum Likelihood estimation procedure.

I guess a solution to this problem is to simulate it by repeating my simulation more often  with less observations to obtain the desired probability. So that's what I'll find out first.

Thanks again Nick!

Jelmer 

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Nick Cox
> Sent: Friday, November 12, 2004 3:41 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: changing number of observations for tempvars
> 
> 
> Absolutely not. The number of observations 
> is a property of your dataset. 
> 
> Your dataset is rectangular, with 
> dimensions 
> 
> 	number of observations X 
> 	number of variables 
> 
> If you create new temporary variables, 
> the number of observations remains 
> the same. Conversely, if you increase 
> the number of observations by using 
> -set obs-, or if you reduce the number 
> of observations by using -drop- or -keep-, 
> either change applies to _all_ variables, 
> whether permanent or temporary. 
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> Ypma, Jelmer Yeb
>  
> > I'm writing an .ado file where I want to use some -tempvar-s. 
> > The number of observations for these -tempvar-s might however 
> > be different from the number of observations in the dataset.  
> > Is there a way to change just the number of observations for 
> > these temporary variables? 
> > 
> 
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