Frequencies for first 10,000 rows of mpre6 variable in natl2002 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,666       56.66       56.66
          2 |      1,945       19.45       76.11
          3 |      1,424       14.24       90.35
          4 |        397        3.97       94.32
          5 |         44        0.44       94.76
          6 |        524        5.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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