Frequencies for first 10,000 rows of precare variable in natlterr2005 dataset :

      Month |
   Prenatal |
 Care Began |
        RFP |
 668=f_mpcb |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         17        0.17        0.17
          1 |        325        3.25        3.42
          2 |      1,249       12.49       15.91
          3 |      1,055       10.55       26.46
          4 |        518        5.18       31.64
          5 |        317        3.17       34.81
          6 |        144        1.44       36.25
          7 |         62        0.62       36.87
          8 |         22        0.22       37.09
          9 |         13        0.13       37.22
         99 |         23        0.23       37.45
          . |      6,255       62.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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