古典測驗理論(CTT: Classical test theory)是統計上用來思考信度(reliability)與效度(validity)的重要依據,可用以下簡單公式表示:
Observed score =
true score + error [Y = T + e]
Every opinion based on scientific criticism I welcome. As to prejudices of so-called public opinion, to which I have never made concessions, now as aforetime the maxim of the great Florentine is mine: ―Segui il tuo corso, e lascia dir le genti.‖ [Follow your own course, and let people talk – paraphrased from Dante] --Karl Marx London July 25, 1867