Frequencies for first 10,000 rows of oncall variable in nhamcsed2008 dataset :

    on call |
  attending |
physician/f |
ellow/resid |
   ent seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,157       91.57       91.57
        yes |        843        8.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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