Frequencies for first 10,000 rows of urf_chyper variable in natlterr2007 dataset :

    Chronic |
Hypertensio |
      n RFP |
688=f_urf_c |
  hyper U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         74        0.74        0.74
          2 |      8,608       86.08       86.82
          9 |      1,318       13.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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