YSK: The Simpson's Paradox is a phenomenon where a trend shows up in one group, then disappears when combined with another. (Laymen's terms--there is a more extensive definition).
from /r/YouShouldKnow
YSK: 辛普森悖論是一種現象，一種趨勢在一個羣體中出現，然後與另一個羣體結合後消失。(外行的說法--有一個更廣泛的定義)。