Hi everyone or anyone who knows this better than me,

I am trying to fit the following short-run equation using ARDL, following in a higly simplified form:

X = a1Y + a2Z + a3W
And a long-run equation:

X = a4 + a5Y + a6Z + a7W
To get any results of significance, I have to use a "aic ec1" ARDL command:
ardl logesgbr loggdpgbr logrergbr logvolgbr , aic ec1 btest
I do get some significant results with this, but I am questioning the type of lags STATA suggests:

- What are lags such as "LD, L2D, D1... etc"?
- Are their "coef." values anything I could use in my equation?
- And what should I do with the adjustment coefficient?

If anyone could shed some light on this, it would be highly appreciated!

Regards,
James