Frequencies for first 10,000 rows of precare variable in natlterr2015 dataset :

      Month |
   Prenatal |
 Care Began |
      00 No |
   prenatal |
       care |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        126        1.26        1.26
          1 |        726        7.26        8.52
          2 |      3,146       31.46       39.98
          3 |      1,958       19.58       59.56
          4 |        833        8.33       67.89
          5 |        556        5.56       73.45
          6 |        413        4.13       77.58
          7 |        282        2.82       80.40
          8 |        308        3.08       83.48
          9 |        197        1.97       85.45
         10 |          3        0.03       85.48
         99 |        374        3.74       89.22
          . |      1,078       10.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016