根据我的观察，你从csv中读入的latam.frm中，TotalPop列是字符串类型，你看，比如第一个，40,765，中间还有逗号呢，这应该是一个字符窜，你得先把字符串转换成整数才行。
This is because the two-tailed test must allow for the possibility of either direction of the $\neq$ sign. (In other words, that the job offer rate for blacks could be higher or lower than for whites.) ## 2.4 Your first regression (of this class) Let's load a new data set...