Frequencies for first 10,000 rows of urf_card variable in natlterr2006 dataset :

Cardiac RFP |
682=f_urf_c |
   ardiac U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          3        0.03        0.03
          2 |      4,793       47.93       47.96
          9 |      1,479       14.79       62.75
          . |      3,725       37.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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