Hi all,

I am trying for the first time to run my difference-in-difference model with inverse propensity score matching. I have an unbalanced longitudinal dataset. So far I was running the below code:

Code:
xtreg logcleanhwtrusi FY2007 FY2008 FY2009 FY2011 FY2012 FY2013 didFY2007 didFY2008 didFY2009 didFY2011 didFY2012 didFY2013, fe
where
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logcleanhwtrusi
is (one of) my outcome variable,
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FY2007 FY2008 FY2009 FY2011 FY2012 FY2013
are my year fixed effects
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didFY2008 didFY2009 didFY2011 didFY2012 didFY2013
are my treatment effects
and I control for fixed effects.

This way I was getting a result. But now I wanted to use "Regression adjustment with IPW".

So I ran the below code

Code:
teffects ipwra (logcleanhwtrusi FY2007 FY2008 FY2009 FY2011 FY2012 FY2013 didFY2007 didFY2008 didFY2009 didFY2011 didFY2012 didFY2013) (intreatmentgroup cleanedhigh1 cleanesempst hgsex hhtype cleanhstenr)
But due to some reason I cannot get the final result and keep getting line by line all the iterations which do not seem to end my output is as follows:

Code:
note: instrument __000003 omitted because of collinearity
Iteration 0:   EE criterion =  3.003e-17  (not concave)
Iteration 1:   EE criterion =  9.017e-18  (not concave)
Iteration 2:   EE criterion =  1.458e-18  (not concave)
Iteration 3:   EE criterion =  6.304e-19  (not concave)
Iteration 4:   EE criterion =  3.107e-19  (not concave)
Iteration 5:   EE criterion =  2.119e-19  (not concave)
Iteration 6:   EE criterion =  1.572e-19  (not concave)
Iteration 7:   EE criterion =  1.152e-19  (not concave)
Iteration 8:   EE criterion =  9.427e-20  (not concave)
Iteration 9:   EE criterion =  7.718e-20  (not concave)
Iteration 10:  EE criterion =  6.520e-20  (not concave)
Iteration 11:  EE criterion =  5.569e-20  (not concave)
Iteration 12:  EE criterion =  4.762e-20  (not concave)
I have waited for it to come to an end but it doesn't end (in a normal time). I feel like I have been doing a logical mistake somewhere. Is there anyone out there who could help me with this? I have read through the stata document about this function and watched some videos but I cannot figure it out. Any help would be highly appreciated. Thank you very very much in advance.