บทคัดย่องานวิจัย

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Distribution among sample test results when testing shelled corn lots for fumonisin.

Whitaker, T.B., Hagler, W.M., Johansson, A.S., Giesbrecht, F.G. and Trucksess, M.W.

Journal of AOAC International 84: 770 – 776.

2001

บทคัดย่อ

Distribution among sample test results when testing shelled corn lots for fumonisin.

The statistical distribution known as the compound gamma function was studied for suitability in describing the distribution of sample test results associated with testing lots of shelled corn for fumonisin. Thirty – two 1.1 kg test samples were taken from each of 16 contaminated lots of shelled corn. An observed distribution consisted of 32 sample fumonisin test results for each lot. The mean funonisin concentration and the variance among the 32 samples fumonisin test results along with the parameters for the compound gamma function were determined for each of the 16 observed distributions. The 16 observed distributions of sample fumonisin test results were compared with the compound gamma function using the Power Divergence test. Parameters of the compound gamma distribution were calculated from the 32 fumonisin sample test results using the method of moments. Using regression analysis, equations were developed that related the parameters of the compound gamma distributuion to fumonisin concentration and the variance associated with a fumonisin test procedure.