Frequencies for first 10,000 rows of chyper variable in natl1991 dataset :

Hypertensio |
n - chronic |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         77        0.77        0.77
          2 |      9,916       99.16       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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