Frequencies for first 10,000 rows of mpre5 variable in natl1990 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,286       72.86       72.86
          2 |      2,016       20.16       93.02
          3 |        379        3.79       96.81
          4 |        189        1.89       98.70
          5 |        130        1.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016