Frequencies for first 10,000 rows of precare variable in natlterr2014 dataset :

      Month |
   Prenatal |
 Care Began |
      00 No |
   prenatal |
       care |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        151        1.51        1.51
          1 |        698        6.98        8.49
          2 |      3,092       30.92       39.41
          3 |      2,057       20.57       59.98
          4 |        917        9.17       69.15
          5 |        565        5.65       74.80
          6 |        427        4.27       79.07
          7 |        314        3.14       82.21
          8 |        260        2.60       84.81
          9 |        102        1.02       85.83
         10 |          4        0.04       85.87
         99 |        336        3.36       89.23
          . |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016