Lets identify the bias that results if we omit x1i rather than x2i from the regression estimating

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Let’s identify the bias that results if we omit x1i rather than x2i from the

�regression estimating equation (11.1). In other words, imagine that the

�population relationship is equation (11.1) but we estimate

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(a) Rework equations (11.2) through (11.6) and (11.9) to identify the bias in this case.

(b) How does this bias compare to the bias term embedded in equation€(
11.32)? Why is it appropriate to identify the latter as an estimate of the former?

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