Frequencies for first 10,000 rows of ume_repec variable in natlterr2007 dataset :

     Repeat |
  C-Section |
        RFP |
733=f_u_rep |
       ec U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        527        5.27        5.27
          2 |      4,179       41.79       47.06
          9 |      1,457       14.57       61.63
          . |      3,837       38.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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