Frequencies for first 10,000 rows of mpre6 variable in natlterr2000 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,524       55.24       55.24
          2 |      2,144       21.44       76.68
          3 |      1,957       19.57       96.25
          4 |        261        2.61       98.86
          5 |         84        0.84       99.70
          6 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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