Frequencies for first 10,000 rows of mpre6 variable in natlterr1997 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,214       52.14       52.14
          2 |      2,446       24.46       76.60
          3 |      1,982       19.82       96.42
          4 |        224        2.24       98.66
          5 |        114        1.14       99.80
          6 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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