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

  iv fluids |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      7,557       75.57       75.57
        yes |      2,443       24.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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