Frequencies for first 10,000 rows of buncreat variable in nhamcsed2014 dataset :

 BUN (Blood |
       urea |
nitrogen)/c |
  reatinine |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      7,966       79.66       79.66
        Yes |      2,034       20.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017