Coefficient of Variation and Mean of Mite Samples, and the Power Relation and Sampling Model Established Wherefrom
Limin Zhao · Sichuan dongwu · 2012
The samples of the linden spider mite, Eotetranychus tiliarium (Herm.), and its predatory phytoseiids were statistically analyzed, and the power relation as well as corresponding equations between the coefficients of variation (CV) and the means (x), CV=axb, were established and validated. The results indicated that the power equations existed objectively, and reflected quantitatively a statistical regularity of interactions between variability and mean. When combined with a t value from t-distribution and a D value for relative precision, a sampling model was formed, n=(t/D·axb)2, which possessed theoretical significance and actual application potentials for related studies. Based on it, the optimal sample units were estimated when taking the linden spider mite and phytoseiid samples.