Frequencies for first 10,000 rows of chyper variable in natl1990 dataset :

Hypertensio |
n - chronic |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         85        0.85        0.85
          2 |      9,867       98.67       99.52
          9 |         48        0.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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