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I want to build a loop that receives number of required lags and returns the regression formula based on that In Eviews 12
i.e. lag=3 : y c x(-1) x(-2) x(-3) and then I want to feed it to my regression analysis.

So I was thinking of using a loop that constructs this formula in the format of strings based on the lags determined. How can I then feed it to the command F(Y).regtype [string] ?

if someone could help me with this question i will really appreciate it. my formulas need 15+ lags inclucded (and it varies) if I always need to input manually it takes lots of time and leave room for input errors. So I need to give the number of lags and receive an autoregressive formula based on that

Read through this:
https://forums.eviews.com/viewtopic.php?f=5&t=1638