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Thank you Gary, very quick reply and very helpful!!!


If I run the regression, should I use HAC to account for heteroskedasticity and autocorrelation, or is this not necessary in this case?

thanks in advance!

I understand the equation, but I don't know how to estimate it in eviews.
basically, if I open the window "estimate equation" where would I go from there?

HI all, please help me estimating the output gap according to following regression equation. Y(t)= a + b*t+ c * t^2 + u y is the gdp at time t t is a time trend i.e. the number of observations and u is the error term and will be the output gap I have already estimated the output gap with the help of...