interclass

Note：Letter alike，interclass difference quiet；letter different，interclass difference patency.

注：字母相同，组间差异不显著；字母不同，组间差异显著。

The interclass difference matrix is calculated by using the fault class feature data from simulation in order to determinate the ambiguity sets.

算法利用电路仿真故特征数据计算故的类间差异矩阵，从而完成故类模糊集的确定。