Frequencies for first 10,000 rows of buncreat variable in nhamcsed2010 dataset :

 BUN (Blood |
       urea |
nitrogen)/c |
  reatinine |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      7,279       72.79       72.79
        yes |      2,721       27.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016