Frequencies for psi_14_postop_dehis_betterstr variable in vwhqi_hosp_ahrq_state dataset :

PSI_14_POSTOP |
_DEHIS_BETTER |      Freq.     Percent        Cum.
--------------+-----------------------------------
            0 |         50       89.29       89.29
Not Available |          6       10.71      100.00
--------------+-----------------------------------
        Total |         56      100.00

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