Frequencies for first 10,000 rows of mpre6 variable in natl1996 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,203       62.03       62.03
          2 |      1,817       18.17       80.20
          3 |      1,507       15.07       95.27
          4 |        271        2.71       97.98
          5 |        127        1.27       99.25
          6 |         75        0.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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