Hi,
 
I've been trying to use qic to compare two GEE models with different
specifications of the working correlation structure. After the program runs the
first iterations I receive an error message "par ambiguous abbreviation." I
have checked the variable names but there is nothing ambiguous there. I've
traced back the iterations and conclude that there should be nothing wrong with
my panel data. I wonder if the problem is with the program. Any leads as to how
to resolve this? I'd appreciate it. 
 
Thanks, 
 
Simone Dietrich
PhD Candidate
The Pennsylvania State University<A
onclick="window.open('https://webmail.psu.edu/webmail/blankIe.html#');return
false;" href="https://webmail.psu.edu/webmail/blankIe.html#"></A>



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