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

    Does your practice exchange |
     patient clinical summaries |
      elecronically with any ot |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                        Unknown |        283        2.83        2.83
       Yes, send summaries only |        773        7.73       10.56
    Yes, receive summaries only |        204        2.04       12.60
Yes, send and receive summaries |      2,428       24.28       36.88
                             No |      6,312       63.12      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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