In order to assess the robustness of our results, we also conduct estimations
for each policy rate (NPR and UF-PR) using OLS and GMM, with
similar results. The t-tests (and also the F-tests in the case of OLS) confirm
the statistical significance of the estimated parameters. Similarly, the Hansen
(1982) overidentification tests (]-tests) confirm that the specification is valid
a t conventional levels of significance.