Frequencies for emer_use variable in person dataset :

  Emergency |
        Use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,053       79.65       79.65
          1 |         13        0.98       80.64
          . |        256       19.36      100.00
------------+-----------------------------------
      Total |      1,322      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016