Frequencies for first 10,000 rows of exchsum3 variable in namcs2011 dataset :

  Practice exchanges patient |
clinic summaries through HIO |
           or state exchange |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
              Not applicable |      6,575       65.75       65.75
                          No |      3,285       32.85       98.60
                         Yes |        140        1.40      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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