ROI(t) = Îæåãã¹ãã«å¯¾ãããã¹ãèªååã®å©ç / Îæåãã¹ã対ãããã¹ãèªååã®ã³ã¹ã = ÎB(t) / ÎC(t) ÎB(t) = Σ(èªåãã¹ãã«ããåºå®è²»ã®åæ¸å)(t) + Σ(n2åæåãã¹ããå®æ½ããå ´åã®å¤åè²»)(t) - Σ(n1åèªåãã¹ããå®æ½ããå ´åã®å¤åè²»)(t) ÎC(t) = Σ(èªåãã¹ãã«ããåºå®è²»ã®å¢å å)(t) + Σ(èªåãã¹ãã®éçºè²») - Σ(æåãã¹ãã®éçºè²») + Σ(èªåãã¹ãã®ã¡ã³ããã³ã¹ã³ã¹ã) (n1/N) n1 = èªåãã¹ãã®å®è¡åæ° n2 = æåãã¹ãã®å®è¡åæ° N = ã¡ã³ããã³ã¹ãå¿ è¦ã«ãªãã¾ã§ã®èªåãã¹ãã®å¹³åå®è¡åæ° ä»åã¯ããã®åè¦ç´ ãé ã«è¦ã¦ããã¾ãããã èªåãã¹ãã«ããåºå®è²»ã®åæ¸å ãèªåãã¹ãã«ããåºå®è²»ã®åæ¸åããã説æãã¾ããã¾ãããã®ãåºå®è²»ãã¨ã¯ãããã¹ãè¨ç»ãããã¹ãè¨è¨ããªã©ããã
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