Frequencies for psi_4_surg_comp variable in vwhqi_hosp_ahrq dataset :

                     PSI_4_SURG_COMP |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
      Better than U.S. National Rate |         46        1.02        1.02
No Different than U.S. National Rate |      1,817       40.22       41.24
                       Not Available |      1,618       35.81       77.05
           Number of Cases Too Small |        980       21.69       98.74
       Worse than U.S. National Rate |         57        1.26      100.00
-------------------------------------+-----------------------------------
                               Total |      4,518      100.00

by Jean Roth , jroth@nber.org , 16 Nov 2016