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问号屋:如何构建美国地区枪支密度变量?

momo  · 知乎专栏  ·  · 2024-05-31 08:13
    

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文献来源 测度1:只看当地的。the total number of dealer and pawnbroker licenses in county i in year t and divide it by county i's land area (100s of square miles). Di;t and PWi;t are the number of Dealer and Pawnbroker licenses issued, Ai is the county's area in square miles (100s). 测度2:考虑周边的。 Johnson, D. B., Robinson, J. J. (2024). Gun Dealer Density and Its Effect on Homicide. The Journal of Law and Economics. (完) ………………………………

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