Recode Gestation data set?

[rpruim]

There are some ugly coding conventions in this data set:

plurality 5 = single fetus (same for all)

sex = 1 for every row in the data

outcome 1 = live birth that survived at least 28 days (same for all)

date birth date where 1096=January 1, 1961 (ugly date format, and example doesn't explain coding scheme)

race mother's race: 0-5=white 6=mex 7=black 8=asian 9=mixed

ed mother's education: 0= less than 8th grade, 1 = 8th -12th grade - did not graduate, 2= HS graduate–no other schooling, 3= HS+trade, 4=HS+some college, 5=College graduate, 6=Trade school, 7=HS unclear

wt.1 mother's prepregnancy weight (in pounds) -- could use a better name

marital marital status: 1=married, 2=legally separated, 3=divorced, 4=widowed, 5=never married

inc family yearly income in $2500 increments: 0=under 2500, 1=2500-4999, ..., 8=12,500-14,999, 9=15000+

smoke does mother smoke? 0=never, 1=smokes now, 2=until current pregnancy, 3=once did, not now

time time since quitting smoking: 0=never smoked, 1=still smokes, 2=during current preg, 3=within 1 year, 4=1 to 2 years ago, 5= 2 to 3 years ago, 6= 3 to 4 years ago, 7=5 to 9 years ago, 8=10+ years ago, 9=quit and don't know

number number of cigarettes smoked per day for past and current smokers 0=never, 1=1-4, 2=5-9, 3=10-14, 4=15-19, 5=20-29, 6=30-39, 7=40-60, 8=60+, 9=smoke but don't know

[rpruim]

@dtkaplan @nicholasjhorton : Do either of you know the history of how this data set entered the package? The reference in the documentation does not seem to lead to the same data set.

[nicholasjhorton]

Alas, I don't. Danny?

[rpruim]

I was able to locate some online documentation that seemed to match the way we documented this data set. I've recoded several variables.