Frequencies for psi_90_safetystr variable in vwhqi_hosp_ahrq dataset :

                       PSI_90_SAFETY |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
      Better than U.S. National Rate |         86        1.90        1.90
No Different than U.S. National Rate |      3,054       67.60       69.50
                       Not Available |      1,188       26.29       95.79
       Worse than U.S. National Rate |        190        4.21      100.00
-------------------------------------+-----------------------------------
                               Total |      4,518      100.00

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