Dear list members,

after running some -ivregress2 2sls- and -ivprobit- regressions, I am unsure which specifications have excessive multi-collinearity. I understand that running the -vif- command after the regressions should tell me but I am still unsure about the following:

(1) Am I right in assuming that any regressor that gets a VIF>10 should be dropped, including if it gets a value of just say 10.50?

(2) Other than after -reg-, after both -ivregress2 2sls- and after -ivprobit- I get the error that I cannot use -vif- but only -vif, uncentered-, which compared to the simple -vif- after -reg- seems to always yield higher estimates. Am I right in assuming that then indeed the uncentered version is appropriate and I need to drop any regressor yielding a VIF>10 there?

(3) I tried to export the VIF results into -outreg2- with the option -addstat(VIF,e(vif))- but got a syntax error and did not find a more suitable syntax for this in the help file examples. How do I instead get the VIF results to be displayed directly in my Excel regression table?

Thank you so much!
PM