Parallel trend tests (IMAGE)

Shanghai Jiao Tong University Journal Center

Parallel trend tests

Caption

We replace the primary independent variable Pilot with five dummy variables: pre_3, pre_2, pre_1, current, andpost_1. If it is three years, two years, or one year before, the same year as, or one year after the enactment of ETS in firm i’s province, the corresponding variable is as signed a value of one. Otherwise, it takes the value zero.

Credit

Weidong Xu, Xinyu Liu and Danyu Zhu (Zhejiang University, China).

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