Data-driven Neyman's tests resulting from a combination of Neyman's sm
ooth tests for uniformity and Schwarz's selection are investigated. As
ymptotic intermediate efficiency of those test with respect to the Ney
man-Pearson test is shown to be 1 for a large of converging alternativ
es. The result shows that data-driven Neyman's tests, contrary to clas
sical goodness-of-fit tests, are indeed omnibus tests adapting well to
the data at hand.