Frequencies for first 10,000 rows of exchsum5 variable in namcs2011 dataset :

  Practice exchanges patient |
    clinic summaries through |
               other/unknown |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
              Not applicable |      6,113       61.13       61.13
                          No |      2,900       29.00       90.13
                         Yes |        987        9.87      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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