Frequencies for first 10,000 rows of precare variable in natlterr2007 dataset :

      Month |
   Prenatal |
 Care Began |
        RFP |
 668=f_mpcb |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         13        0.13        0.13
          1 |        302        3.02        3.15
          2 |      1,324       13.24       16.39
          3 |      1,140       11.40       27.79
          4 |        539        5.39       33.18
          5 |        264        2.64       35.82
          6 |        117        1.17       36.99
          7 |         63        0.63       37.62
          8 |         39        0.39       38.01
          9 |         10        0.10       38.11
         99 |         26        0.26       38.37
          . |      6,163       61.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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