Introduction to data

Each data set within the text is described in this appendix, and there is a corresponding page for each of these data sets at openintro.org/data. This page also includes additional data sets that can be used for honing your skills. Each data set has its own page with the following information:

• List of the data set’s variables.

• CSV download.

• R object file download.

• stent30, stent365 $\to$ The stent data is split across two data sets, one for days 0-30 results and one for days 0-365 results.
  Chimowitz MI, Lynn MJ, Derdeyn CP, et al. 2011. Stenting versus Aggressive Medical Therapy for Intracranial Arterial Stenosis. New England Journal of Medicine 365:993-1003. www.nejm.org/doi/full/10.1056/NEJMoa1105335.
  NY Times article: www.nytimes.com/2011/09/08/health/research/08stent.html.

• loan50, loans_full_schema $\to$ This data comes from Lending Club (lendingclub.com), which provides a large set of data on the people who received loans through their platform. The data used in the textbook comes from a sample of the loans made in Q1 (Jan, Feb, March) 2018.

• county, county_complete $\to$ These data come from several government sources. For those variables included in the county data set, only the most recent data is reported, as of what was available in late 2018. Data prior to 2011 is all from census.gov, where the specific Quick Facts page providing the data is no longer available. The more recent data comes from USDA (ers.usda.gov), Bureau of Labor Statistics (bls.gov/lau), SAIPE (census.gov/did/www/saipe), and American Community Survey (census.gov/programs-surveys/acs).

• Nurses’ Health Study $\to$ For more information on this data set, see
  www.channing.harvard.edu/nhs

• The study we had in mind when discussing the simple randomization (no blocking) study was
  Anturane Reinfarction Trial Research Group. 1980. Sulfinpyrazone in the prevention of sudden death after myocardial infarction. New England Journal of Medicine 302(5):250-256.