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# A tibble: 2 x 5termestimatestd.errorstatisticp.value<chr><dbl><dbl><dbl><dbl>1 (Intercept) 4.990.003021655.2.96e-1372is_febTRUE0.02700.004276.323.99e-8
$$y=\beta_1Jan + \beta_2Feb$$
所以就是看$\hat r_{Jan}$ 和 $\hat r_{Feb}$ 孰高孰低。
用 boostrap 的方法,
重复抽样 Jan,建立若干个子样本,算均值,因此可以得到一个均值分布
Feb 类似。
然后去比较两个均值分布的差异。
下面是仿真代码
结果是显著的。
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