汽车盲区与观察方法
安全驾驶的要素：速度差、距离、视野、预判、友善、专注、车况
Cochran’s Q test in R, or the extension of McNemar’s test for more than two groups
Introduction
In previous articles, we showed how to test whether two qualitative variables are related thanks to the Chi-square test of independence in R (and how to compute it by hand). Both articles insist on one important limitation: this test requires independent observations. If you have dependent observations (paired samples), …