Frequencies for psi_6_iat_ptx_betterstr variable in vwhqi_hosp_ahrq_state dataset :

PSI_6_IAT_PTX |
      _BETTER |      Freq.     Percent        Cum.
--------------+-----------------------------------
            0 |         41       73.21       73.21
            1 |          8       14.29       87.50
            2 |          1        1.79       89.29
Not Available |          6       10.71      100.00
--------------+-----------------------------------
        Total |         56      100.00

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