Frequencies for psi_6_iat_ptx_betterstr variable in vwhqi_hosp_ahrq_state dataset :

PSI_6_IAT_P |
  TX_BETTER |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         48       85.71       85.71
          1 |          2        3.57       89.29
        N/A |          6       10.71      100.00
------------+-----------------------------------
      Total |         56      100.00

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