Frequencies for first 10,000 rows of mpre5 variable in natl1994 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,138       81.38       81.38
          2 |      1,443       14.43       95.81
          3 |        267        2.67       98.48
          4 |        110        1.10       99.58
          5 |         42        0.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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