Frequencies for first 10,000 rows of urf_chyper variable in linkpe2009psden dataset :

    Chronic |
Hypertensio |
      n U;R |
(f_urf_chyp |
     er rep |
      flag) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         98        0.98        0.98
          2 |      9,859       98.59       99.57
          9 |         43        0.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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