Birth weight data

low= qualitative (indicates low birth weight in new born, 1: <2500g, 0:>=2500g)
age= quantative (mother's age in years)
lwt= quantative (mother weight before pregnancy in pounds (lbs))
race= qualitative (race, 1=white, 2= black, 3=other)
smoke= qualitative (smoking during pregnancy, 1=yes, 0=no)
ptl=qualitative (history of premature labour,1=yes, 0=no)
ht=qualitative (history of hypertension, 1=yes, 0=no)
ui=qualitative (presence of uterine irritability, 1=yes, 0=no)
ftv=qualitative (# of physician visits in 1st trimester, 0=none, 1=one, 2=two, etc.)
btw=quantitave (birth weight in grams)