Frequencies for first 10,000 rows of eimmreg variable in namcs2010 dataset :

          does practice have |
computerized system for elec |
      report to immunization |
                   registrie |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                     unknown |        658        6.58        6.58
                         yes |      3,603       36.03       42.61
                          no |      4,506       45.06       87.67
yes, but turned off/not used |      1,233       12.33      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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