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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