Frequencies for first 10,000 rows of cardiac variable in natlterr1996 dataset :

    Cardiac |
    disease |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         25        0.25        0.25
          2 |      9,971       99.71       99.96
          9 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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