Normal Probability Plots|outlier
6.4 Assessing Normality; Normal Probability Plots The?normal probability plot?is a?graphical technique?to identify substantive departures from?normality ? ? ? 即如果sample满足正态分布,则1-12位置上对应的y值应该为这一列上的值 Noted: 之前统计正态分布时需要由直方图过渡到正态曲线,横坐标是每一类,在这里是样本本身。 ? ? ? 由table3一一对应,作图: ? ? 根据以上rule判断正态情况。 Note: If two or more observations in a sample are equal,you can think of them as?slightly different from one another for purposes of obtaining their normal scores. ? ? 如图,可将normal-score值改为对应的percentage A probability or percent scale is used instead of normal scores Detecting Outliers with Normal Probability Plots ? ? a去掉outlier得到b ? ? 由此判断该数据为正态分布 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |