Frequencies for first 10,000 rows of urf_chyper variable in natlterr2005 dataset :

    Chronic |
Hypertensio |
      n U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         82        0.82        0.82
          2 |      8,131       81.31       82.13
          9 |      1,787       17.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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