Dear scholars, I am having some issues using Gcrobustvar estimator for causality. After loading the pvalues.
I estimated using the code
Code:
gcrobustvar loco2 lgdp , pos(1,2) lags (1/4) trimming (0.05)
I got an error matrix has missing values.
I tried with another variable,
​code
Code:
gcrobustvar loco2 ltour  , pos(1,2) lags (1/4) trimming (0.05)
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I got another error" initial weight matrix is not positive definite;check your instruments () specification or try another wintial() option.

Please how do I solve this.