Frequencies for first 10,000 rows of ivfluids variable in nhamcsed2012 dataset :

  IV fluids |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      7,554       75.54       75.54
        Yes |      2,446       24.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016