babies                package:UsingR                R Documentation

_M_o_t_h_e_r_s _a_n_d _t_h_e_i_r _b_a_b_i_e_s _d_a_t_a

_D_e_s_c_r_i_p_t_i_o_n:

     A collection of variables taken for each new mother in a Child and
     Health Development Study.

_U_s_a_g_e:

     data(babies)

_F_o_r_m_a_t:

     A data frame with 1,236 observations on the following 23
     variables.

          Variables in data file

     _i_d identification number

     _p_l_u_r_a_l_t_y 5= single fetus

     _o_u_t_c_o_m_e 1= live birth that survived at least 28 days

     _d_a_t_e birth date where 1096=January1,1961 

     _g_e_s_t_a_t_i_o_n length of gestation in days

     _s_e_x infant's sex 1=male 2=female 9=unknown

     _w_t birth weight in ounces (999 unknown)

     _p_a_r_i_t_y total number of previous pregnancies including fetal deaths
          and still births, 99=unknown

     _r_a_c_e mother's race 0-5=white 6=mex 7=black 8=asian 9=mixed
          99=unknown 

     _a_g_e mother's age in years at termination of pregnancy, 99=unknown

     _e_d 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&7 Trade
          school HS unclear, 9=unknown

     _h_t mother's height in inches to the last completed inch 99=unknown

     _w_t_1 mother prepregnancy wt in pounds, 999=unknown 

     _d_r_a_c_e father's race, coding same as mother's race.

     _d_a_g_e father's age, coding same as mother's age.

     _d_e_d  father's education, coding same as mother's education.

     _d_h_t father's height, coding same as for mother's height

     _d_w_t  father's weight coding same as for mother's weight

     _m_a_r_i_t_a_l 1=married, 2= legally separated, 3= divorced, 4=widowed,
          5=never married

     _i_n_c family yearly income in $2500 increments 0 = under 2500,
          1=2500-4999, ..., 8= 12,500-14,999, 9=15000+, 98=unknown,
          99=not asked

     _s_m_o_k_e does mother smoke? 0=never, 1= smokes now,  2=until current
          pregnancy, 3=once did, not now, 9=unknown

     _t_i_m_e If mother quit, how long ago? 0=never smoked, 1=still smokes,
          2=during current preg, 3=within 1 yr, 4= 1 to 2 years ago, 5=
          2 to 3 yr ago, 6= 3 to 4 yrs ago, 7=5 to 9yrs ago,  8=10+yrs
          ago, 9=quit and don't know, 98=unknown, 99=not asked 

     _n_u_m_b_e_r  number of cigs 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,98=unknown, 99=not
          asked

_S_o_u_r_c_e:

     This dataset is found from <URL:
     http://www.stat.berkeley.edu/users/statlabs/labs.html>. It
     accompanies the excellent text _Stat Labs: Mathematical Statistics
     through Applications_ Springer-Verlag (2001) by Deborah Nolan and
     Terry Speed.

_E_x_a_m_p_l_e_s:

     data(babies)
     plot(wt ~ factor(smoke), data=babies)
     plot(wt1 ~ dwt, data=babies, subset=wt1 < 800 & dwt < 800)

