Thank you Maarten.
According to your help the problem is because few variables in my
model has a missing value for the observations. And , in fact, I want
to say that my panel data is unbalanced. Do you know please how to
calculate the random error component (u) in my panel data with another
way?
Thanks
Regards
Carmen
2012/11/8 Maarten Buis <maartenlbuis@gmail.com>:
> On Thu, Nov 8, 2012 at 1:05 PM, Carmen Blanco wrote:
>> I need to predict the random error component (u) in my panel data and
>> Stata shows me that 52 missing values are generated. Could someone
>> tell me please why does it happen?
>
> Probably one or more of the variables in your model has a missing
> value for these observations. As a consequence these observations were
> not used in your model, and not used for predicting the random
> component.
>
> Hope this helps,
> Maarten
>
> ---------------------------------
> Maarten L. Buis
> WZB
> Reichpietschufer 50
> 10785 Berlin
> Germany
>
> http://www.maartenbuis.nl
> ---------------------------------
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