Frequencies for first 10,000 rows of ume_primc variable in natl2004 dataset :

    Primary |
  C-Section |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,428       14.28       14.28
          2 |      8,537       85.37       99.65
          9 |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 21 Jan 2016