Frequencies for first 10,000 rows of ume_primc variable in natl2008 dataset :

    Primary |
  C-Section |
        RFP |
732=f_u_pri |
       mc U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,949       19.49       19.49
          2 |      7,996       79.96       99.45
          9 |         55        0.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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