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st: RE: ml and variable types


From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: ml and variable types
Date   Wed, 20 Dec 2006 21:54:06 -0000

The answer to the first question is No. If this 
were compulsory, Stata would have no problem 
in detecting any deficiency and throwing you out of -ml-. 

Without more detail, even an -ml- expert (not me) 
might have difficulty advising here, but a guess 
is that your problem is much more likely 
to be with the model you are trying to estimate -- 
you may be trying to fit an elephant to an oak 
tree -- than with variable types. 

Nick 
[email protected] 

Rachel
 
> I'm wondering whether all the variables used in "ml model" equations
> need to be of type double.
> 
> All my temporary variables are of type double, but the non-temp
> (external) variables used to calculate xb are floats and bytes.  "ml
> display" is giving me dots in place of the standard errors and/or the
> program seems to stop iterating, so I'm wondering whether the external
> variable types are the problem.

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