[Limdep Nlogit List] Problem with NLSUR
James.Rao at agr.uni-goettingen.de
Fri Mar 13 08:14:46 EST 2009
Dear limdep listers,
Am pretty new to limdep so kindly excuse my silly questions and mistakes. Am
trying to estimate a nonlinear system of equations using the NLSUR command
for NL3SLS exemplified as follows:
NLSUR ;Lhs = lnY, lnfert_d
;Fn1 = a1 + a2*x2 + a3*x3
;Fn2 = -Log(a2) + b1*x3 + b2*x4
;Labels = a1, a2, a3, b1, b2
;Start = 0, 1, 0, 0, 0
;Inst = x3, x4$
Whenever I try to run this estimation I get the following error messages
"Error 143: Models - estimated variance matrix of estimates is singular"
"Error 447: Current estimated covariance matrix for slopes is singular"
Where could the mistake be?
Rao E.O. James (Msc)
Research Associate/PhD Student
Department of Agricultural Economics and Rural Development
Georg-August University of Göttingen
Platz der Gottinger Sieben 5
37073 Göttingen, Germany.
E-mail: jimrao2 at yahoo.co.uk; James.Rao at agr.uni-goettingen.de
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