Frequencies for first 10,000 rows of obssep variable in nhamcsed2013 dataset :

       Is this |
observation or |
      clinical |
 decision unit |
    physically |
 separate from |
       the ED? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         Blank |        426        4.26        4.26
       Unknown |        298        2.98        7.24
Not applicable |      5,092       50.92       58.16
           Yes |      2,453       24.53       82.69
            No |      1,731       17.31      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016