Smooth Transition Regression estimation issue

[purdued]

Hi all,

I'm currently trying to estimate an non-linear STR with the following:

smpl @all

series dr_uk = r_uk - r_uk(-1)
series ldr_uk = dr_uk(-1)
series t = @trend + 1

coef(1) gamma
coef(1) lambda
coef(7) beta
coef(7) theta


LS R_UK = (1 - 1/(1 + @exp(-gamma(1)*(t - lambda(1)))))*(BETA(1) + BETA(2)*R_UK(-1) + BETA(3)*LDR_UK + BETA(4)*PI_GUK + BETA(5)*Y_GUK + BETA(6)*PI_UK + BETA(7)*CLI_UK) + (1/(1 + @exp(-gamma(1)*(t - lambda(1)))))*(THETA(1) + THETA(2)*R_UK(-1) + THETA(3)*LDR_UK + THETA(4)*PI_GUK + THETA(5)*Y_GUK + THETA(6)*PI_UK + THETA(7)*CLI_UK)

I get an error saying "overflow of analytical derivatives" although I get estimates for my coefficients. What I don't get is a equation object.

Anyone knows what's happening here?

I'm new to eviews so I'm hoping its something stupid.

Thanks
Dave

[trubador]

Hard to tell without seeing the workfile. Have you tried different starting values?