Hi everyone, I wan to remove all the variables in my data which have collinearity. I found the command "_rmcoll" but it does not automatically drop the collinear variables but only list them.

In the example from the Stata manual:

Code:
webuse auto
generate tt = turn + trunk
_rmcoll price-tt, forcedrop
I would like Stata to remove the variable tt.
Apparently by adding "forcedrop" the collinear variables should be dropped, but when I try it, this does not happen. Am I missing something or is there another way to drop that list of variables?

Any help would be very much appreciated!