The size and geographic distribution of the player community is highly variable.
当然，各个游戏的玩家社区的规模和地理划分有很大差异。
By constructing instrument variable in term of the geographic characteristics, we efficiently tackle the problem of endogeneity in the regressions.
本文根据地理特征构造工具变量，有效地控制了变量的内生性问题。
By constructing instrument variable in term of the geographic characteristics, we efficiently tackle the problem of endogeneity in the regressions.
本文根据地理特征构造工具变量，有效地控制了变量的内生性问题。
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