. estat gatetest
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Group treatment-effects heterogeneity test
H0: Group average treatment effects are homogeneous
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 ( 1)  [GATE]0bn.incomecat - [GATE]1.incomecat = 0
 ( 2)  [GATE]0bn.incomecat - [GATE]2.incomecat = 0
 ( 3)  [GATE]0bn.incomecat - [GATE]3.incomecat = 0
 ( 4)  [GATE]0bn.incomecat - [GATE]4.incomecat = 0
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    chi2(4) =  22.39
Prob > chi2 = 0.0002
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