Frequencies for first 10,000 rows of mpcb variable in natlterr2007 dataset :

      Month |
   Prenatal |
 Care Began |
        RFP |
669=f_mpcb_ |
        u U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        350        3.50        3.50
          1 |        686        6.86       10.36
          2 |        950        9.50       19.86
          3 |        820        8.20       28.06
          4 |        499        4.99       33.05
          5 |        449        4.49       37.54
          6 |        259        2.59       40.13
          7 |        170        1.70       41.83
          8 |        165        1.65       43.48
          9 |        109        1.09       44.57
         99 |      1,706       17.06       61.63
          . |      3,837       38.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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