Consider estimating the effect of personal computer ownership, as represented by a binary variable, PC, on college GPA, colGPA. With data on SAT scores and high schoool GPA you postulate the model: colGPA = β0 + β1hsGPA + β2SAT + β3PC+u
If variable z can be used as a proxy, explain how to conduct an estimation. Are the estimated coefficients consistent?
Consider estimating the effect of personal computer ownership, as represented by a binary variable, PC, on...
3. Consider estimating the effect of personal computer ownership, as represented by a binary variable, PC, on college GPA, colGPA. With data on SAT scores and high schoool GPA you postulate the model Why might u and PC be positively correlated? If the given equation is estimated by OLS using a random sample of college students, is likelily to have an upward or downward asymptotic bias? Briefly explain why? (c) What are some variables that might be good proxies for...
3. Estimating models with dummy variables Consider the following simple model of the college grade point average determination: colGPA = Bo + DPC + DihsGPA + B2ACT + u, colGPA = college GPA PC = personal computer (PC) ownership hsGPA = high school GPA ACT = achievement test score Suppose that in estimating this model, we obtain the following: colGPA = 1.26 + 0.16 PC + 0.447 hsGPA + 0.009 ACT Suppose n=141 and R2 =0.219. Which of the following...
All of the following questions are in relation to the following journal article which is available on Moodle: Parr CL, Magnus MC, Karlstad O, Holvik K, Lund-Blix NA, Jaugen M, et al. Vitamin A and D intake in pregnancy, infant supplementation and asthma development: the Norwegian Mother and Child Cohort. Am J Clin Nutr 2018:107:789-798 QUESTIONS: 1. State one hypothesis the author's proposed in the manuscript. 2. There is previous research that shows that adequate Vitamin A intake is required...