Frequencies for first 10,000 rows of mpre5 variable in natlterr2001 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,787       77.87       77.87
          2 |      1,839       18.39       96.26
          3 |        242        2.42       98.68
          4 |         94        0.94       99.62
          5 |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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