Mathematics, 11.05.2021 19:40 ddcope1030
You recall from one of your earlier lectures in macroeconomics that the per capita income depends on the savings rate of the country: those who save more end up with a higher standard of living. To test this theory you collect data from the Penn World Tables on GDP per worker relative to the United States (RelProd) in 1990 and the average investment share of GDP from 1980-1990 (SK), remembering that investment equals saving. The regression results in the following output:
RelProd-0.08+2.44xS, R-0.46, SER 0.21
(0.04) (0.38)
(a) Interpret the regression results carefully.
(b) Calculate the t-statistics to determine whether the two coefficients are significantly different from zero. Justify the use of a one-sided or two-sided test.
(c) You accidentally forget to use the heteroskedasticity-robust standard errors option in your regression follows RelProdニー0.08 +2.44«SK, R2-0.46, SER=0.21 (0.04) (0.26) You are delighted to find that the coefficients have not changed at all and that your results have become even more significant. Why haven't the coefficients changed? Are the results really more significant? Explain.
(d) Upon reflection you think about the advantages of OLS with and without homoskedasticity-only standard errors. What are these advantages? Is it likely that the error terms would be heteroskedastic in this situation?
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You recall from one of your earlier lectures in macroeconomics that the per capita income depends on...
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