Frequencies for first 10,000 rows of mpre6 variable in natlterr2001 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,529       55.29       55.29
          2 |      2,258       22.58       77.87
          3 |      1,839       18.39       96.26
          4 |        242        2.42       98.68
          5 |         94        0.94       99.62
          6 |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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