Frequencies for first 10,000 rows of ume_primc variable in natlterr2008 dataset :

    Primary |
  C-Section |
        RFP |
732=f_u_pri |
       mc U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        621        6.21        6.21
          2 |      4,025       40.25       46.46
          9 |      1,415       14.15       60.61
          . |      3,939       39.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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