Frequencies for first 10,000 rows of mpre6 variable in natlterr1999 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,427       54.27       54.27
          2 |      2,252       22.52       76.79
          3 |      1,922       19.22       96.01
          4 |        271        2.71       98.72
          5 |         85        0.85       99.57
          6 |         43        0.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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