Econometrics

Stock/Watson - Introduction to Econometrics 4th Edition

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Documentation for Birthweight_Smoking

The datafile Birthweight_Smoking is from the 1989 linked National Natality-Mortality Detail files, which contains a census of infant births and deaths. The data in bw_smoking.data are for births in Pennsylvania in 1989.

These data were provided by Professors Douglas Almond, Kenneth Chay, and David Lee and are a subset of the data used in their paper “The Costs of Low Birth Weight,” Quarterly Journal of Economics, August 2005, 120(3): 1031-1083.

The file contains 3,000 observations on the variables described below

Variable Description Birthweight and Smoking 1 birthweight birth weight of infant (in grams) 2 smoker indicator equal to one if the mother smoked during pregnancy and zero, otherwise. Mother’s Attributes 3 age age 4 educ years of educational attainment (more than 16 years coded as 17) 5 unmarried indicator =1 if mother is unmarried This Pregnancy 6 alcohol indicator=1 if mother drank alcohol during pregnancy 7 drinks number of drinks per week 8 tripre1 indicator=1 if 1st prenatal care visit in 1st trimester 9 tripre2 indicator=1 if 1st prenatal care visit in 2nd trimester 10 tripre3 indicator=1 if 1st prenatal care visit in 3rd trimester 11 tripre0 indicator=1 if no prenatal visits 12 nprevist total number of prenatal visits