中文说明： 用卡方统计量的Q-Q图检验法探讨三元数据的正态性检验问题。 评价正态性的方法，如果：1、大约有一半的马氏距离d小于或等于q(0.5)，即这些马氏距离中一半或一半以上落在轮廓线之内; 2、画出马氏距离和与之对应的卡方百分位数的点(sort_d,qRec)的图形近似是一条通过原点且斜率为1的直线，那么表明是三元正态的。
English Description：
&Using Q-Q graph test of chi square statistics, this paper discusses the normality test of three metadata. &If: 1. About half of the Mahalanobis distance D is less than or equal to Q (0.5), that is, half or more of these Mahalanobis distances fall within the contour line; 2. Draw the points of Mahalanobis distance and the corresponding chi square percentile (sort)_ d. If the graph of qrec is approximately a straight line passing through the origin with a slope of 1, it means that it is Trivariate normal.