蓄积系数又称为蓄积因子或积累系数，是指多次染毒使半数动物出现毒性效应的总有效剂量(ED50（n）)与一次染毒的半数有效量（ED50（1））之比值，毒性效应包括死亡。
蓄积性毒性试验结果表明：伊维菌素对小鼠的蓄积系数是4.53，属于中度蓄积药物。
The results of accumulative toxicity experiment show that: the accumulation coefficient of ivermectin in mice is 4.53, which indicate that ivermectin is a medium accumulation drug.
林龄单因变量的蓄积量生长模型决定系数低，引入地位指数和密度指数再次参数化的生长模型可显著提高模型拟合度。
Single age variable stock volume growth model had low coefficient of determination, but it was improved a lot by introducing site index and stand density index in reparameterization.
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