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  • ATET estimation after ETREGRESS

    This is regarding the ETREGRESS example in STATA V14 manual (here, Example 6 in page 18).

    In Page 18, code for estimating ATET is given as
    Code:
    margins, predict(cte) subpop(if ins == 1) vce(unconditional)
    In Page 17, an alternate code for estimating ATET is given as
    Code:
    margins r.ins, vce(unconditional) contrast(nowald) subpop(if ins==1)
    The two codes produce different results of ATET. Would you know the difference between the two estimates? Which factors govern which estimate should be used

    Thanks

    Gouri
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