Whitaker T B, Freese L, Giesbrecht F G, Slate A B
USDA/ARS, North Carolina State University, Raleigh 27695-7625, USA.
J AOAC Int. 2001 Nov-Dec;84(6):1941-6.
Using the binomial distribution, the effect of sample size on the variability among sample test results when sampling a lot with 1.0% genetically modified (GM) or biotech seed was evaluated. The coefficient of variation, cv, among 500-seed sample test results taken from a lot with truly 1.0% was computed to be 44.5%. Increasing sample size to 1000 seeds reduced the cv among sample test results to 31.5%. The effects of sample size and accept/reject limits on the buyer's risk (bad lots accepted) and the seller's risk (good lots rejected) was also evaluated assuming a tolerance of 1.0% GM seed. Increasing sample size decreases both the buyer's and seller's risks at the same time. Using an accept/reject limit below the regulatory tolerance decreases the buyer's risk, but increases the seller's risk. Using an accept/reject limit above the regulatory tolerance decreases the seller's risk but increases the buyer's risk.
使用二项分布，评估了在抽取含有1.0%转基因（GM）或生物技术种子的批次样本时，样本量对样本测试结果变异性的影响。从真正含有1.0%的批次中抽取的500粒种子样本测试结果的变异系数cv计算为44.5%。将样本量增加到1000粒种子可将样本测试结果的cv降低到31.5%。假设转基因种子的容忍度为1.0%，还评估了样本量和接受/拒绝限度对买方风险（接受不良批次）和卖方风险（拒收良好批次）的影响。增加样本量会同时降低买方和卖方的风险。使用低于监管容忍度的接受/拒绝限度会降低买方风险，但会增加卖方风险。使用高于监管容忍度的接受/拒绝限度会降低卖方风险，但会增加买方风险。
