QUESTION 1
Omitted variable bias is a problem because
it prevents the model from being able to be estimated by
ordinary least squares.
it causes the model to no longer be linear in the
parameters.
it prevents correctly estimating marginal effects.
it causes perfect multicollinearity.
QUESTION 2
In multiple linear regression analysis, the number of
independent variables should be
as large as possible.
more than 5.
guided by economic theory.
enough to guarantee that statistical significance is
achieved.
QUESTION 3...