st: estat overid & sample weights

["C.J. Krizan" <c_j_krizan@yahoo.com>]

Can anyone tell me why the OVERID option on IVREGRESS needs the FORCEWEIGHTS option when using data with sample weights.  Also, how do I determine if my results are valid afterwards?
  
There is a blurb in the documentation that the reported critical values may be inappropriate with weighted data and I'm trying to determine if I can trust it in my case. 

Any references you can provide would be helpful.
  
 
Thanks, 
 
C.J.



      

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