Frequencies for first 10,000 rows of mpre6 variable in natlterr1995 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,226       52.26       52.26
          2 |      2,336       23.36       75.62
          3 |      1,997       19.97       95.59
          4 |        252        2.52       98.11
          5 |        164        1.64       99.75
          6 |         25        0.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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