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Dear Eviews Gareth,

all c's are coefficients to be estimated and independent variable "n" is a positive number for all data. How did you determine that this cannot be a positive log ? Doesnt eviews have to estimate itas such ? I am confused..
Sorry to be such a bother on this but would very much appreciate if you can elaborate some more.
Best regards,

log(c(5)+(1-c(2))*c(1)*n)

Yes, it is estimating the C coefficients, but it requires starting values to do so. It uses whatever is currently in C as starting values. Currently you have zeros in C.

Dear Gareth,
I want to confirm that since I have 5 coefficients in my model, it is enough to specify first 5 values in the C - coefficient vector.

Thnak you and regards

As long as you have used C(1) through C(5), yes.

Dear Gareth,

I tried 0.1 (which has been mentioned as a safer value by Eviews Glenn at another post thread.) and 0.001 and 0.0001 for c(1) to c(5), but none of them worked I keep getting "Insufficient number of observations" upfront. I am very much stuck on this, should I be trying randomly and if so between which values can you give me a slightest clue ?
Many thanks in advance
regards

log(y) = (1/((1-c(2))*(1-c(3))-c(1)))*((1-exp(-c(1)*@trend))*c(2)*(1-c(3))*log(s)+(1-exp(-c(1)*@trend))*c(1)*log(l)+(1-exp(-c(1)*@trend))*c(4)*log(fi)+(1-exp(-c(1)*@trend))*log(c(5)+(1-c(2))*c(1)*n)+(1-exp(-c(1)*@trend))*c(2)*(1-c(3))*log((n+delta)+(c(1)*n))+(1-exp(-c(1)*@trend))*log(y(-1)))

Look at this term: You need to find values of C(1), C(2) and C(5) that ensure this is positive for all the values of n.

Dear Gareth,

I manually calculated expression within parenthesis with excel for c(1) to c(5) = 0,1 and all came out positive, thus ln() of expression can be calculated as well. Moreover I calculated all ln() expressions manually in excel as well.

Is there any other option which might be the cause of this error so that I can check it as well ? (I dont have any idea)
Thank you and Regards,

PS.I attached both excel and eviews files below. sheet "manual" has the calculation.

Hello,

I was not able to make progress on this issue since. I am aware it became a nuisance to you but would appreciate any further guides, suggestions anything..

Best regards

The only suggestion I have is to provide different starting values until it works. Or re-formulate the expression into something less complicated.