Frequencies for first 10,000 rows of mpre10 variable in natl1986 dataset :

      Month |
   Prenatal |
 Care began |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,072       50.72       50.72
          2 |      2,054       20.54       71.26
          3 |        996        9.96       81.22
          4 |        639        6.39       87.61
          5 |        408        4.08       91.69
          6 |        276        2.76       94.45
          7 |        154        1.54       95.99
          8 |         66        0.66       96.65
          9 |        214        2.14       98.79
         10 |        121        1.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016