Frequencies for first 10,000 rows of precare variable in natlterr2011 dataset :

      Month |
   Prenatal |
 Care Began |
        RFP |
 668=f_mpcb |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        144        1.44        1.44
          1 |        504        5.04        6.48
          2 |      1,906       19.06       25.54
          3 |      1,766       17.66       43.20
          4 |        804        8.04       51.24
          5 |        390        3.90       55.14
          6 |        267        2.67       57.81
          7 |        157        1.57       59.38
          8 |         83        0.83       60.21
          9 |         41        0.41       60.62
         10 |          4        0.04       60.66
         99 |      1,398       13.98       74.64
          . |      2,536       25.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015