Dear Friends,
Now i am doing a Hausman specification test, testing the difference
between GMM-instrumental variable estimates and OLS estimates for the possible
endogenity of the regressors. In some cases i getting negative Chi-square
value. (This is because the variance-covariance matrix of the differeces of the
coefficients is not positive definite) How can I interpret it? In the case of
negative chi-square values, can i accept the null hypothesis? Any suggestions
andcomments are most welcome.
Thanking you in advance,
M Parameswaran
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M Parameswaran
Ph.D Student
Centre for Development Studies,
Prasanthnagar Road, Ulloor,
Trivandrum 695 011,
Kerala,India.
Phone: 0091-0471-442481
E-mail: [email protected]
[email protected]
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