Question: 'Using Equations 20.17 (page 631) for the incidentally truncated bivariate-normal distribution, show that the expectation of the error i in the Heckman regression model (Equations

'Using Equations 20.17 (page 631) for the incidentally truncated bivariate-normal distribution, show that the expectation of the error εi in the Heckman regression model

(Equations 20.18 and 20.19 on page 632) conditional on Y being observed is Eðεi j ζi > 0Þ ¼ Eðεijδi > & ciÞ ¼ σεrεδm &ci ð Þ

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