Frequencies for first 10,000 rows of mpcb variable in natl2005 dataset :

      Month |
   Prenatal |
 Care Began |
        RFP |
669=f_mpcb_ |
        u U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         30        0.30        0.30
          1 |      2,574       25.74       26.04
          2 |      3,335       33.35       59.39
          3 |      1,902       19.02       78.41
          4 |        781        7.81       86.22
          5 |        417        4.17       90.39
          6 |        262        2.62       93.01
          7 |        190        1.90       94.91
          8 |        131        1.31       96.22
          9 |        113        1.13       97.35
         99 |        265        2.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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