Frequencies for first 10,000 rows of ivfluids variable in nhamcsed2015 dataset 

  IV fluids |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      7,486       74.86       74.86
        Yes |      2,514       25.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017