Frequencies for first 10,000 rows of precare variable in natlterr2010 dataset :

      Month |
   Prenatal |
 Care Began |
        RFP |
 668=f_mpcb |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         85        0.85        0.85
          1 |        380        3.80        4.65
          2 |      1,709       17.09       21.74
          3 |      1,445       14.45       36.19
          4 |        594        5.94       42.13
          5 |        334        3.34       45.47
          6 |        180        1.80       47.27
          7 |        108        1.08       48.35
          8 |         55        0.55       48.90
          9 |         36        0.36       49.26
         10 |          5        0.05       49.31
         99 |        413        4.13       53.44
          . |      4,656       46.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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