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Modelos de regressão com variáveis<br />

X e interações<br />

• A inclusão de controles pelas características individuais<br />

pode seguir a estratégia de Rubin (1977):<br />

Y it=α+α 1d t + α 2d j + βd jt +Xγ +<br />

(X-E(X))d jtω + ε ijt

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