Frequencies for first 10,000 rows of mpre5 variable in natl1992 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,576       75.76       75.76
          2 |      1,870       18.70       94.46
          3 |        389        3.89       98.35
          4 |        133        1.33       99.68
          5 |         32        0.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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