Frequencies for first 10,000 rows of chyper variable in natlterr1999 dataset :

Hypertensio |
n - chronic |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         61        0.61        0.61
          2 |      9,935       99.35       99.96
          9 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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