Frequencies for first 10,000 rows of urf_chyper variable in natl2006 dataset :

    Chronic |
Hypertensio |
      n RFP |
688=f_urf_c |
  hyper U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        113        1.13        1.13
          2 |      9,743       97.43       98.56
          9 |        144        1.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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