Frequencies for first 10,000 rows of obssep variable in nhamcsed2015 dataset :

       Is this |
observation or |
      clinical |
 decision unit |
    physically |
 separate from |
       the ED? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         Blank |         57        0.57        0.57
       Unknown |        189        1.89        2.46
Not applicable |      5,301       53.01       55.47
           Yes |      2,459       24.59       80.06
            No |      1,994       19.94      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017