Frequencies for first 10,000 rows of mpre6 variable in natlterr1998 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,478       54.78       54.78
          2 |      2,293       22.93       77.71
          3 |      1,927       19.27       96.98
          4 |        172        1.72       98.70
          5 |        105        1.05       99.75
          6 |         25        0.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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