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

    aggregated number of hours |
     hospital was on ambulance |
             diversion in 2006 |      Freq.     Percent        Cum.
-------------------------------+-----------------------------------
          0 hours on diversion |      3,046       30.46       30.46
       1-99 hours on diversion |      1,223       12.23       42.69
    100-499 hours on diversion |      1,126       11.26       53.95
500 or more hours on diversion |      1,484       14.84       68.79
  diversion data not available |      3,121       31.21      100.00
-------------------------------+-----------------------------------
                         Total |     10,000      100.00

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