Frequencies for first 10,000 rows of mpre5 variable in natl1997 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,152       81.52       81.52
          2 |      1,414       14.14       95.66
          3 |        296        2.96       98.62
          4 |         88        0.88       99.50
          5 |         50        0.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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