Frequencies for first 10,000 rows of oncall variable in nhamcsed2006 dataset :

    on call |
  attending |
physician/f |
 ellow seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,353       93.53       93.53
        yes |        647        6.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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