Frequencies for first 10,000 rows of mpcb variable in natl2006 dataset :

      Month |
   Prenatal |
 Care Began |
        RFP |
669=f_mpcb_ |
        u U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         38        0.38        0.38
          1 |      2,707       27.07       27.45
          2 |      3,240       32.40       59.85
          3 |      1,900       19.00       78.85
          4 |        710        7.10       85.95
          5 |        369        3.69       89.64
          6 |        257        2.57       92.21
          7 |        193        1.93       94.14
          8 |        138        1.38       95.52
          9 |        115        1.15       96.67
         99 |        333        3.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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