Author Question: Simultaneous causality bias A) is also called sample selection bias. B) happens in complicated ... (Read 201 times)

clippers! · **on:** Jun 29, 2018

Simultaneous causality bias

A) is also called sample selection bias.
B) happens in complicated systems of equations called block recursive systems.
C) results in biased estimators if there is heteroskedasticity in the error term.
D) arises in a regression of Y on X when, in addition to the causal link of interest from X to Y, there is a causal link from Y to X.

Question 2

The best way to interpret polynomial regressions is to

A) take a derivative of Y with respect to the relevant X.
B) plot the estimated regression function and to calculate the estimated effect on Y associated with a change in X for one or more values of X.
C) look at the t-statistics for the relevant coefficients.
D) analyze the standard error of estimated effect.