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

In the last |
 two years, |
has your ED |
  increased |
 the number |
of standard |
  treatment |
         sp |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |         98        0.98        0.98
    Unknown |        765        7.65        8.63
        Yes |      2,815       28.15       36.78
         No |      6,322       63.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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