rule of 8...

...If someone discusses the budget of the federal government of the U.S.A. with fewer than 8 independent numbers or factors or categories, then chances are that the discussion is oversimplified. Figures have been skipped to present a "condensed" viewpoint that's more consistent with a partisan narrative. The 8 or more numbers are "independent" in a statistical (information-theoretical) sense: none of the numbers is a complete mathematical function of the others, such as the third always equaling the difference of the first and second.