Frequencies for first 10,000 rows of mpre5 variable in natlterr2002 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,012       80.12       80.12
          2 |      1,634       16.34       96.46
          3 |        266        2.66       99.12
          4 |         71        0.71       99.83
          5 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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