EViews.com

Hi,

I am new to using Eviews. I want to fit my data to an exponential curve: y = a*e^(bx). I am running the regression using two methods:

1. MICE_1= COEF(1)*(EXP(COEF(2)*OBSERVATION))

2. LOG(MICE_1) = COEF(3) + COEF(4)*OBSERVATION

Since, both equations are the same, coef(2)=coef(4) and coef(1)= exp(coef(3))

However, I am getting different coefs. using the two equations. Can someone please explain why is this happening?

Thanks,
Abhinav

Remember that regression equations include error terms. The error terms here are not the same.

If I plot my data in excel and go for an exponential trendline, the coefficients of the resulting equation I get match the coefficients I get from this equation: LOG(MICE_1) = COEF(3) + COEF(4)*OBSERVATION

However, I was thinking that the exponential trendline for my data in excel (of the form y = a*e^(bx)) would be same as evaluating MICE_1= COEF(1)*(EXP(COEF(2)*OBSERVATION)) in Eviews. Why is it being evaluated differently in these two software? Any idea?

I believe that Excel takes logs.