Frequencies for first 10,000 rows of ivfluids variable in nhamcsed1992 dataset :

  IV fluids |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,708       87.08       87.08
          1 |      1,292       12.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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