Frequencies for psi_national_scr variable in vwhqi_hosp_ahrq_national dataset :

PSI_NATIONA |
      L_SCR |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |         30      100.00      100.00
------------+-----------------------------------
      Total |         30      100.00

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