Frequencies for first 10,000 rows of emred variable in nhamcsed2009 dataset :

       does |
  emergency |
   dept use |
 electronic |
 medical or |
     health |
  (emr/ehr) |
    records |
  (not incl |      Freq.     Percent        Cum.
------------+-----------------------------------
         -8 |         81        0.81        0.81
          1 |      3,994       39.94       40.75
          2 |      4,304       43.04       83.79
          3 |      1,621       16.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016