Hello,

I am trying to run the bounds test for cointegration.

I have performed
Code:
varsoc depvar indpvars
to get the optimal lag and I get 4

I then try to run the ardl using
Code:
ardl depvar indpvars, maxlags(4) aic
I get the following:

note: L2.lpopd omitted because of collinearity
note: L4.lpopd omitted because of collinearity
note: L3.lpopg omitted because of collinearity
note: L4.lpopg omitted because of collinearity
Collinear variables detected.

I don't know how to fix this. How do I go about doing this. sorry I am new to state and ARDL and can't seem to find an appropriate answer on internet search