区域试验中品种稳定性参数数量分类的改进方法

A MODIFICATION OF QUANTITATIVE CLASSIFlCATION OF STABILITY PARAMETERS IN VARIETAL REGIONAL TESTS

本文建议以历届区试品种ＣＶ值大样本中点值Ｍ’为总体正态分布原点，选用适宜小概率，导出标准差理论值Ｓ’后，再进行数量分类计算。经此改进后，既不出现负值，且覆盖面广，更合理适用，可进一步提高区试品种评定分类的正确性。

The present paper proposes that quantitative classification be calculated with the median M’oflarge sample CV values from all yearly varietal regional tests as the origin point of the populationnormal distribution after deriving the theoratical value of standard deviation S’by screening suitablesmall probability. With this modification,no negative values appear and the coverage iS broadened,thus making the method more reasonable and suitable in application and increasing the accuracy inthe evaluation of the cultivars’scores in regional tests.