We wish to better understand the factors that contribute to a student's favorable overall evaluation of an instructor. The data set TeachingEval_HW.dta contains average faculty evaluation scores, class size, a dummy variable indicating required courses, and the percent of grades that were A-and above. Table 8.10 lists the variables.

(a) Estimate a model ignoring the panel structure of the data. Use overall evaluation of the instructor as the dependent variable and the class size, required, and grades variables as independent variables. Report and briefly describe the results.

(b) Explain what a fixed effect for each of the following would control for: instructor, course, and year.

(c) Use the equation from part (a) to estimate a model that includes a fixed effect for instructor. Report your results, and explain any differences from part (a).

(d) Estimate a two-way fixed effects model with year as an additional fixed effect. Report and briefly describe your results.

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TABLE 8.10 Variables for Instructor Evaluation Data Variable name Eval Apct Enrollment Required InstrID Course ID Year Description Average course evaluation on a 5-point scale Percent of students who receive an A or A- in the course Number of students in the course A dummy variable indicating if the course was required A unique identifying number for each instructor A unique identifying number for each course Academic year