Frequencies for first 10,000 rows of mpre6 variable in natl1995 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,277       62.77       62.77
          2 |      1,863       18.63       81.40
          3 |      1,456       14.56       95.96
          4 |        234        2.34       98.30
          5 |         93        0.93       99.23
          6 |         77        0.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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