Frequencies for ins_art_openings_press_ulcer variable in hcccoefn dataset :

ins_art_ope |
nings_press |
     _ulcer |      Freq.     Percent        Cum.
------------+-----------------------------------
       .347 |          1      100.00      100.00
------------+-----------------------------------
      Total |          1      100.00

by Jean Roth , jroth@nber.org , 7 Feb 2019