help diff
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Title

    diff --       Differences in differences estimation


Syntax

        diff outcome_var [if] [in] [weight] ,[ options]


Description

    diff performs several differences in differences (diff-in-diff) estimations of the treatment effect of a given outcome
    variable from a pooled base line and follow up dataset: Single Diff-in-Diff, Diff-in-Diff controlling for covariates,
    Kernel-based Propensity Score Matching diff-in-diff, and the Quantile Diff-in-Diff.

ATE不懂指什么，请楼主说清楚

DID双重差分，要求两年的混合横截面数据就行，当然面板数据更好。
ATE没听说过。

楼主问的DID与ATE，与Wooldridge爱说的不太一样，
但与Cameron、Trivedi相同，所以ATE应当是指Average Treatment Effect

指令的话
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参考看看

ATE就是指Average Treatment Effect！