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

      do ed |
 physicians |
       make |
  decisions |
        for |
patients in |
       this |
observation |
or clinical |
        dec |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |        126        1.26        1.26
         -7 |      7,258       72.58       73.84
          1 |      1,969       19.69       93.53
          2 |        647        6.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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