Frequencies for first 10,000 rows of mpre6 variable in natl1992 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,711       57.11       57.11
          2 |      1,865       18.65       75.76
          3 |      1,870       18.70       94.46
          4 |        389        3.89       98.35
          5 |        133        1.33       99.68
          6 |         32        0.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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