Frequencies for first 10,000 rows of creatin variable in nhamcsed2004 dataset :

 creatinine |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      7,986       79.86       79.86
        yes |      2,014       20.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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