Frequencies for first 10,000 rows of precare variable in natlterr2006 dataset :

      Month |
   Prenatal |
 Care Began |
        RFP |
 668=f_mpcb |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         11        0.11        0.11
          1 |        329        3.29        3.40
          2 |      1,306       13.06       16.46
          3 |      1,103       11.03       27.49
          4 |        473        4.73       32.22
          5 |        259        2.59       34.81
          6 |        122        1.22       36.03
          7 |         54        0.54       36.57
          8 |         36        0.36       36.93
          9 |         12        0.12       37.05
         99 |         20        0.20       37.25
          . |      6,275       62.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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