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雷达卡
-做了个面板固定效应的回归，结果发现两个问题
1，main_lprice，main_lprice_mines 的系数是一样的，
3，第三列有一个系数是0.000，
写信给教授，他回信说
You include mines on its own but you cannot do that because
It is captured by the cell fixed effect. What you can do
Is to keep all observations even those with changes in
mining and see what you get.
（注：其中mines_a,和mines_around是两种mines）
不明白他在说什么，也不知道我的结果到底出了什么问题。请教高手
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(1) (2) (3) (4) (5) (6)
laid laid laid laid laid laid
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mines_a -0.023 0.000
(-1.014) (.)
main_lprice 0.355* 0.355*
(1.882) (1.880)
mines_around 0.044 0.024
(0.526) (0.304)
main_lprice_mines 0.395** 0.395** 0.395**
(1.997) (1.996) (1.997)
mines_aroundPrice 0.007
(0.823)
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CountryYear_FE Yes Yes Yes Yes Yes Yes
Cell_FE Yes Yes Yes Yes Yes Yes
N 112794 112794 112607 112607 112607 112794
r2_a 0 0 0 0 0 0
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t statistics in parentheses
* p<0.1, ** p<0.05, *** p<0.01
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