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17.871Spring 2000Problem Set # 1: Using STATAHanded out: February 12, 2002Due back: February 21, 20021. Using a text editor such as EMACS or the STATA do-file editor, type the text from Exhibit 1in the document “How to Use the STATA infile and infix Commands” into Athena and save itin a file named scores.dat on your home directory. Write a “do” file that will create a STATAdata set from this raw data and save it as a file called “scores.dta”. Turn in a “log” file thatdocuments the STATA commands you used to read in the data and save it.2. Find two tables that interest you in the Statistical Abstract of the United States which meetthe following criteria: (1) they have between 25 and 52 observations and (2) they have thesame units of analysis (e.g., states, years, nations).a. Call these two tables Table A and Table B. Create a STATA data set that containsone variable, plus the identifying variable (like state or year), from Table A. Save it. Create a STATA dat set that consists of one variable, plus the identifying variable (likestate or year), from Table B. Save it. Merge the two data sets. Save the merged dataset.b. Turn in the following:(1) A “do file” that shows how you created the data sets and merged them.(2) A printout of the data.(3) A short (one paragraph, 2 or 3 sentences) description of the tables you gotyour data from.3. Do the following Review Exercises in Freedman, at the end of Chapter 6, beginning on p. 104. When you write your explanations, use complete, well-constructed sentences and paragraphs.Review Exercises: 1, 2, 3 (p. 104)Special Review Exercises: 13 (p. 107) and 15 (p. 108).4. MIT wants to improve how it delivers mental health services to its students. It can choosebetween mutually exclusive (for this exercise) policy choices: expanding the size of the mentalhealth staff or making mental health services more accessible by expanding walk-in hours. MITwants to make the choice based on sound social science research. It identifies 10 “peer”universities that have recently expanded the size of its mental health staff and 10 other “peer”universities that have recently expanded walk-in hours. MIT researchers go to theseuniversities and administer surveys to students to assess how satisfies they are with campusmental health services. The results of the survey are these: Students on the campuses that2expanded the size of the staff rate their satisfaction an average of 8.2 on a scale of 1–10. Students on the campuses that expanded walk-in hours rate their satisfaction an average of 9.0.The MIT researchers conclude that expanding walk-in hours is more effective in achievingstudent satisfaction than expanding staff.Discuss the validity of this research design.5. In the 2000 presidential election, George W. (Quincy) Bush received 47.9% of the popularvote case in the United States. The following reports the final “horse race” results from thevarious polls taken right before the election: (All of these results were reported the day beforethe election)CBS: 44%CNN/Gallup: 48%IBD: 48%Reuters: 46%Voter.com: 50%What accounts for these


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MIT 17 871 - Problem Set # 1: Using STATA

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