ricardo_chicas (6/4/2013)
not an stats issue
There's no evidence to support anything else. Lowell's explanation seems the most likely.
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden