Frequencies for psi_90_safety variable in vwhqi_hosp_ahrq dataset :

                       PSI_90_SAFETY |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                                     |        159        3.29        3.29
      Better than U.S. National Rate |        156        3.23        6.52
No Different than U.S. National Rate |      2,931       60.68       67.20
                       Not Available |      1,373       28.43       95.63
       Worse than U.S. National Rate |        211        4.37      100.00
-------------------------------------+-----------------------------------
                               Total |      4,830      100.00

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