Many papers discuss the statistical validity of the observational evidence for persistent transition paths.

Testing is voluntary, which undermines the statistical validity of the program.

Absolutely nothing, because there is no statistical validity to these comparisons, but the exercise is entertaining.

Direct comparisons between the following polls have no statistical validity:

Clinical psychologists generally regard them as having sufficient statistical validity for many clinical purposes.

S.E.C. officials have recently warned in speeches that companies appear to be picking discount rates with no statistical validity.

But he said the standing of the leaders had clear statistical validity.

In order to provide some statistical validity to the project it was necessary to find other guinea pigs (or just plain pigs).

Picking these two time parameters is a trade-off between optimization time and statistical validity of the results.

To specify if individual abnormal returns differ from zero with some statistical validity, test statistics need to be applied.