Frequencies for first 10,000 rows of ume_primc variable in natlterr2005 dataset :

    Primary |
  C-Section |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        651        6.51        6.51
          2 |      3,863       38.63       45.14
          9 |      1,741       17.41       62.55
          . |      3,745       37.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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