Why does estat dwatson throw up an error when I run it?

[Andrew Goran]

I am running an ARDL model with four variables. Now when I try to run Durbin-Watson tests, I get the error estat dwatson is not valid r(321). I am not sure what is happening.

Here is my code:

ardl stir narrowmg inf gdpg, lags(1 0 1 0) regstore(ecreg)
regress
estat dwatson

Then, I get estat dwatson not valid.

[Andrew Goran]

I found the answer. Here is my revised code for anyone who has a similar problem

ardl stir narrowmg inf gdpg, lags(1 0 1 0) regstore(ecreg) 
estimates restore ecreg 
regress 
estat dwatson