求求各位高手了

that should be a good question. i ran into such problem as well in my last project: to compare the coefficients of risk factors between female and male population on quantile regression models. in the paper manuscript , they said the different coefficients were seen between male and female population. my comment on that was we should be prudent to arrive at such a conclusion since we were not able to (or we did not) compare them through a test.\jingju

继续请求高手回答，谢谢

Y=a*X+bZ
Z是一个二元变量，1表示民营，0表示国有，如果b明显区别于0是不是可以了？

是，我初步就是这样做的，但这样做总觉得没有我上面说的这种方法直观。况且，我已经也读过用同一模型回归，比较系数的文章。就是想不起来是什么文章了。
继续等待高手。。。。。。。。。。。。。