Frequencies for first 10,000 rows of mpcb_rec6 variable in natlterr2003 dataset :

      Month |
   Prenatal |
 Care Began |
 Recode 6 U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,841       58.41       58.41
          2 |      2,309       23.09       81.50
          3 |      1,542       15.42       96.92
          4 |        220        2.20       99.12
          5 |         71        0.71       99.83
          6 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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