Econ 360 Econometrics Already Passed

Independently pooled cross sectional data {Ans: -different cross sectional data collected at different points in time and pooled together}What do we know about out of sample prediction error based on a multiple linear regression {Ans: it has expectation 0}What creates perfect collinearity {Ans: -bad specification of the model -defining variables inappropriately -small sample size}interpretation of CIs {Ans: a 95% CI means that for 95% of the random samples drawn from the population, the interval computed using the role Bj-hat +/- c * se(Bj-hat) will include the v value Bj}Adjusted R^2 {Ans: R^2-bar = 1-((SSR/(n-k-1)/(SST/(n-1))}B in BLUE {Ans: -best -smallest variance (MLR.1-MLR.5)}