Frequencies for first 10,000 rows of ivfluids variable in nhamcsed2007 dataset :

  iv fluids |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      7,384       73.84       73.84
        yes |      2,616       26.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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