Johansson A S, Whitaker T B, Giesbrecht F G, Hagler W M, Young J H
US Department of Agriculture, Agricultural Research Service, North Carolina State University, Raleigh 27695-7625, USA.
J AOAC Int. 2000 Sep-Oct;83(5):1279-84.
The effects of changes in sample size and/or sample acceptance level on the performance of aflatoxin sampling plans for shelled corn were investigated. Six sampling plans were evaluated for a range of sample sizes and sample acceptance levels. For a given sample size, decreasing the sample acceptance level decreases the percentage of lots accepted while increasing the percentage of lots rejected at all aflatoxin concentrations, and decreases the average aflatoxin concentration in lots accepted and lots rejected. For a given sample size where the sample acceptance level decreases relative to a fixed regulatory guideline, the number of false positives increases and the number of false negatives decreases. For a given sample size where the sample acceptance level increases relative to a fixed regulatory guideline, the number of false positives decreases and the number of false negatives increases. For a given sample acceptance level, increasing the sample size increases the percentage of lots accepted at concentrations below the regulatory guideline while increasing the percentage of lots rejected at concentrations above the regulatory guideline, and decreases the average aflatoxin concentration in the lots accepted while increasing the average aflatoxin concentration in the rejected lots. For a given sample acceptance level that equals the regulatory guideline, increasing the sample size decreases misclassification of lots, both false positives and false negatives.
研究了样本量和/或样本接受水平的变化对带壳玉米黄曲霉毒素抽样计划性能的影响。针对一系列样本量和样本接受水平，对六个抽样计划进行了评估。对于给定的样本量，降低样本接受水平会降低被接受批次的百分比，同时增加所有黄曲霉毒素浓度下被拒收批次的百分比，并降低被接受批次和被拒收批次中的平均黄曲霉毒素浓度。对于给定的样本量，当样本接受水平相对于固定的监管指南降低时，假阳性数量增加，假阴性数量减少。对于给定的样本量，当样本接受水平相对于固定的监管指南增加时，假阳性数量减少，假阴性数量增加。对于给定的样本接受水平，增加样本量会提高低于监管指南浓度下被接受批次的百分比，同时增加高于监管指南浓度下被拒收批次的百分比，并降低被接受批次中的平均黄曲霉毒素浓度，同时增加被拒收批次中的平均黄曲霉毒素浓度。对于等于监管指南的给定样本接受水平，增加样本量会减少批次的错误分类，包括假阳性和假阴性。
