Estimate a linear probability model:

Consider the multiple regression model:

y = β₀+β₁x₁+.....+β_kx_k +u

Suppose that assumptions MLR.1-MLR4 hold, but not assumption MLR.5

(a) Are the standard t and F-statistics valid if the sample is suf?ciently large? If not, what would you do about it?

(b) Suppose that the sample is very small. What is the implication for the heteroscedas-tic robust standard errors? Suppose that someone said that you instead should use Feasable Generalized Least Squares to correct for heteroscedasticity in small samples. What would be your response?

(a) Estimate a linear probability model that explains whether a man was arrested in 1986 by his prior criminal and employment record (pcnv, avgsen, tottime, ptime86, qemp86). Use robust standard errors. Why do you need to correct for heteroscedasticity? Justify

(b) What is the interpretation of the intercept?

(c) Interpret the effect of time locked up in 1986 (ptime86) on the probability of arrest. Is this a big effect?

(d) Set all explanatory variables to zero, except for ptime86, and compute the predicted probability of arrest in 1986 for a man who was locked up in all 12 months in 1986. Does this prediction make sense?

(e) Test whether avgsen and tottime are jointly statistically signi?cant at the 5% level. Would your test be valid if you had not used robust standard errors in (a)?

(f) Calculate the predicted probabilities and verify that all the ?tted values are between 0 and 1. What is the smallest value you observe? And the largest?

Posted Date: 2/14/2013 2:21:36 AM | Location : United States

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