The dimension of Scoring matrixes X is descended by using scoring rate or passing rate or coefficientofcorrelation or guess rate when estimating those item parameters.
在对这些参数进行估计时，将得分矩阵分别采用得分率、通过率、相关系数、猜测率进行降维处理。
2
Results The average equivalent sound level and the detectable rate of workers hearing loss were exponential positive correlation, the coefficientofcorrelation r was 0 812 45.
There existed a significant positive linear correlation between total Fe and active Fe in leaves after injection of iron fertilizer, the coefficientofcorrelation being 0.9842.