All entries for Thursday 11 August 2005

August 11, 2005


(1) Example 4.1 of Wooldridge (2002) shows that E(y|x) can be
m(x,theta), a nonlinear function. Also, the model (distribution) of Y|X can be a member of the linear exponential family yielding the quasi log-likelihood.

(2) In this light, there seems to be four components: distribution of Y|X, model for E(Y|X), distribution of X and a model of R.

(3) In the case where we have to estimate selection probabilities, Y and X are required to be observed only when S =1. Thus, X can be missing with Y???

Normally, MAR => R depends on X which is fully observed. In this case, it is still MAR but R depends on the completely observed Z and X can be missing ???

August 2005

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