Frequencies for first 10,000 rows of mpcb variable in natl2008 dataset :

      Month |
   Prenatal |
 Care Began |
        RFP |
669=f_mpcb_ |
        u U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        249        2.49        2.49
          1 |      1,315       13.15       15.64
          2 |      4,534       45.34       60.98
          3 |      1,928       19.28       80.26
          4 |        853        8.53       88.79
          5 |        484        4.84       93.63
          6 |        282        2.82       96.45
          7 |        175        1.75       98.20
          8 |        124        1.24       99.44
          9 |         41        0.41       99.85
         99 |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016