Frequencies for first 10,000 rows of ehrwho3r variable in namcs2010 dataset :

    orders for rx or lab |
       tests sent by lab |
     technician - edited |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
n/a based on ectoe/ecpoe |      3,484       34.84       34.84
       box is not marked |      6,180       61.80       96.64
           box is marked |        336        3.36      100.00
-------------------------+-----------------------------------
                   Total |     10,000      100.00

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