Frequencies for first 10,000 rows of exchsum3o variable in nhamcsopd2011 dataset :

 How does OPD electronically |
        send/receive patient |
 clinical summaries: Through |
                         Hea |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
All boxes are blank for item |     10,000      100.00      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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