BUSN5000 HW 8 Part B

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Feb 20, 2024

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11/6/23, 2 : 09 PM Assignment 8: Regression Discontinuity Page 1 of 10 https://chris-cornwell.shinyapps.io/Assignment8/#section-part-b-empirical-analysis Part B: Empirical Analysis In this exercise, you will replicate some of the main findings of Carpenter and Dobkin (2009) (herea ! er CD) as reported in Angrist and Pischke (AP). Remember, AP use a version of the CD data that has been collapsed or aggregated to the month level. You will access the data from the Mastering Metrics site using the read_dta function from the haven package. Background To get ready for your analysis, let’s review CD’s “first-stage” findings on the e " ects of MLDA laws on drinking behavior. Question 1: CD show that drinking increases a ! er the 21st birthday on CD show that drinking increases a ! er the 21st birthday on _____ _____ Correct! Question 2: Their preferred specification indicates a statistically significant Their preferred specification indicates a statistically significant _____ percentage-point e " ect on the likelihood of having 12 or _____ percentage-point e " ect on the likelihood of having 12 or more drinks in a year. (Answer with an integer value). more drinks in a year. (Answer with an integer value). 6 Correct! Question 3: the intensive but not the extensive margin. ✗ neither the intensive nor the extensive margin. ✗ both the extensive and intensive margins. ✓ the extensive but not the intensive margin. ✗ Assignment Assignment 8: Regression 8: Regression Discontinuity Discontinuity A: Short Answer (https://chris- cornwell.shinyapps.io/Assignment8/#section- a-short- answer) Part B: Empirical Analysis (https://chris- cornwell.shinyapps.io/Assignment8/#section- part-b- empirical- analysis) Submission Start Over

11/6/23, 2 : 09 PM Assignment 8: Regression Discontinuity Page 2 of 10 https://chris-cornwell.shinyapps.io/Assignment8/#section-part-b-empirical-analysis This percentage-point e " ect translates into about a/an _____ This percentage-point e " ect translates into about a/an _____ percent increase on the likelihood of having 12 or more drinks percent increase on the likelihood of having 12 or more drinks in a year. (Answer with an integer value). in a year. (Answer with an integer value). 11 Correct! Question 4: Their preferred specification indicates a _____ percentage- Their preferred specification indicates a _____ percentage- point increase in the proportion of days drinking. (Answer with point increase in the proportion of days drinking. (Answer with an integer value). an integer value). 2 Correct! Question 5: This percentage-point e " ect translates into about a/an _____ This percentage-point e " ect translates into about a/an _____ percent increase in the proportion of days drinking. (Answer percent increase in the proportion of days drinking. (Answer with an integer value.) with an integer value.) 21 Correct! Question 6: CD lump all causes potentially related to _____ into the ______ CD lump all causes potentially related to _____ into the ______ (internal/external) category and all causes unrelated to ______ (internal/external) category and all causes unrelated to ______ (internal/external) into the ______ category. (internal/external) into the ______ category. alcohol, external, alcohol, internal Correct! Question 7:

11/6/23, 2 : 09 PM Assignment 8: Regression Discontinuity Page 3 of 10 https://chris-cornwell.shinyapps.io/Assignment8/#section-part-b-empirical-analysis The distinction between causes of death is important because The distinction between causes of death is important because estimating the treatment e " ect on _____ causes should estimating the treatment e " ect on _____ causes should function as a falsification exercise. function as a falsification exercise. internal Correct! Continue Summary statistics Now, let’s turn to your analysis. Construct a table of summary statistics for the outcomes all , mva , suicide and homicide separately for under- 21 and 21-and-over observations. First, create treatment-indicator and centered age variables. Next, use datasummary to create the summary statistics table distinguishing and observations. Give a title to your table. R Code ! Start Over ▶ Run Code mlda = read_dta ("http://masteringmetrics.c mlda <- mlda %>% mutate( over21 = ifelse (agecell >= 21, 1, 0), Over21 = ifelse (over21==1, ">= 21", "< age = agecell - 21) < 21 >= 21 R Code ! Start Over ▶ Run Code datasummary( all + external + internal ~ Over21*(N + Me data= mlda , title="Table 1. Summary Statistics, under ) 1 2 3 4 5 6 7 8 1 2 3 4 5

11/6/23, 2 : 09 PM Assignment 8: Regression Discontinuity Page 4 of 10 https://chris-cornwell.shinyapps.io/Assignment8/#section-part-b-empirical-analysis Answer the following questions based on the Table 1. Question 8: Deaths from motor vehicle accidents for under 21-year-olds Deaths from motor vehicle accidents for under 21-year-olds comprise about _____ percent of all deaths.(Round to the comprise about _____ percent of all deaths.(Round to the nearest integer.) nearest integer.) 32 Correct! Question 9: The homicide rate for under 21-year-olds is about _____ per The homicide rate for under 21-year-olds is about _____ per _____. (Report an answer to two decimal places.) _____. (Report an answer to two decimal places.) 16.64, 100,000 Correct! Question 10: Overall, MVA deaths (increase/decrease/stay the same) _____ Overall, MVA deaths (increase/decrease/stay the same) _____ a ! er age 21. a ! er age 21. decrease Correct! Continue Table 1. Summary Statistics, under/over 21 < 21 < 21 >= 21 >= 21 N Mean Mean SD SD N Mean Mean SD SD all 24 92.80 2.38 24 98.54 2.67 external 24 74.29 2.19 24 76.48 3.31 internal 24 18.51 1.34 24 22.06 1.42

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