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

 Does your OPD exchange patient |
             clinical summaries |
 electronically with any other  |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                          Blank |     10,000      100.00      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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