品种区域试验中稳定性参数数量分类的改进方法

A MODIFICATION OF THE QUANTITATIVE CLASSIFICATION OF STABILITY PARAMETERS IN CULTIVAR REGIONAL TESTS

该文建议以历届区试品种CV值大样本中点值M为总体正态分有原点，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，作为对原法的改进方法。经此改进，既不出现负值、且复盖面广；更加合理、适用；可进一步提高区试品种评定分类的正确性。

The present paper proposed that the 'median' M of large sample CV values from all yearly cultivar regional tests were taken as the origion point of the population normal distribution , by screening suitable little probability, derived out the theoritic value of standard deviation S' then culculatheg quantitatire classifi-catiou. Using the modification, not only no negative values appear, but also broaden its cover regions, more reasonble and more suitable in application,further more, it could increase thecorrectness to evaluate cultivar S' score in rebonal tests.