Frequencies for iqi_national_scr variable in vwhqi_hosp_ahrq_national dataset :

IQI_NATIONAL_ |
          SCR |      Freq.     Percent        Cum.
--------------+-----------------------------------
Not Available |         69      100.00      100.00
--------------+-----------------------------------
        Total |         69      100.00

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