hausman name-consistent [name-efficient]
(1) obtain an estimator that is consistent whether or not the hypothesis is true;
      (2) store the estimation results under name-consistent by using estimates store;
      (3) obtain an estimator that is efficient (and consistent) under the hypothesis that you are testing, but inconsistent otherwise;
      (4) store the estimation results under name-efficient by using estimates store;
      (5) use hausman to perform the test
和无偏性没有关系