Frequencies for first 10,000 rows of exchsum1 variable in namcs2011 dataset :

  Practice exchanges patient |
    clinic summaries through |
              EMH/EHR vendor |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
              Not applicable |      6,524       65.24       65.24
                          No |        863        8.63       73.87
                         Yes |      2,613       26.13      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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