Frequencies for first 10,000 rows of mpre5 variable in natlterr1996 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,699       76.99       76.99
          2 |      1,974       19.74       96.73
          3 |        203        2.03       98.76
          4 |        104        1.04       99.80
          5 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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