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

    Primary |
  C-Section |
        RFP |
732=f_u_pri |
       mc U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        421        4.21        4.21
          2 |      2,972       29.72       33.93
          9 |      1,263       12.63       46.56
          . |      5,344       53.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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