Frequencies for first 10,000 rows of cardiac variable in natlterr1995 dataset :

    Cardiac |
    disease |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         34        0.34        0.34
          2 |      9,959       99.59       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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