Frequencies for psi_11_postop_respfail_rate variable in vwhqi_hosp_ahrq dataset :

PSI_11_POST |
OP_RESPFAIL |
      _RATE |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      4,594      100.00      100.00
------------+-----------------------------------
      Total |      4,594      100.00

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