Frequencies for first 10,000 rows of mpre6 variable in natlterr1996 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,402       54.02       54.02
          2 |      2,297       22.97       76.99
          3 |      1,974       19.74       96.73
          4 |        203        2.03       98.76
          5 |        104        1.04       99.80
          6 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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