Frequencies for effectivenessofcarenationalcompa variable in hqi_hosp dataset :

       Effectiveness of care |
         national comparison |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
  Above the National average |        997       20.69       20.69
  Below the National average |        509       10.56       31.26
               Not Available |      1,116       23.16       54.42
Same as the National average |      2,196       45.58      100.00
-----------------------------+-----------------------------------
                       Total |      4,818      100.00

by Jean Roth , jroth@nber.org , 15 Nov 2016