Frequencies for first 10,000 rows of mpre6 variable in natl2001 dataset :

      Month |
   Prenatal |
 Care Began |
   Recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,381       63.81       63.81
          2 |      1,798       17.98       81.79
          3 |      1,417       14.17       95.96
          4 |        246        2.46       98.42
          5 |        122        1.22       99.64
          6 |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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