Frequencies for first 10,000 rows of f_mpcb_u variable in natlterr2003 dataset :

      Month |
   Prenatal |
 Care Began |
          U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         23        0.23        0.23
          1 |      9,977       99.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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