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Econometria1-Transp-tema5-2

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Regresión logit (cont.)<br />

donde F(β0 + β1X) =<br />

Pr(Y = 1|X) = F(β0 + β1X)<br />

1+<br />

e<br />

1<br />

− ( β + β X )<br />

0 1<br />

Ejemplo: β0 = -3, β1= 2, X = .4,<br />

por tanto, β0 + β1X = -3 + 2×.4 = -2.2<br />

Pr(Y = 1|X=.4) = 1/(1+e –(–2.2) ) = .0998<br />

¿Por qué complicarse con el logit si tenemos el probit?<br />

• Históricamente, ha tenido ventajas computacionales<br />

• En la práctica, es muy similar al probit<br />

.<br />

9-23

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