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This is allowed since S j ( i ) has zero expectation value.
Under the additional assumption that the error term u i has zero mean conditional on all covariates X i and S i, one could apply simple OLS estimation to identify the effects of the right-hand side variables on Y i.
Similar(58)
I have zero talents.
"I had zero expectations.
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I have zero qualifications.
I had zero traffic.
I have two wins.
I have two questions.
I have one leader.
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