Frequencies for first 10,000 rows of precare_rec variable in linkpe2009psden dataset :

      Month |
   Prenatal |
 Care Began |
   Recode R |
(f_mpcb rep |
      flag) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,797       47.97       47.97
          2 |      1,591       15.91       63.88
          3 |        151        1.51       65.39
          4 |         12        0.12       65.51
          5 |         27        0.27       65.78
          . |      3,422       34.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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