Frequencies for first 10,000 rows of primaryreason variable in nadacc dataset :

       Primary Reason |      Freq.     Percent        Cum.
----------------------+-----------------------------------
                      |         17        0.17        0.17
            Help Desk |         32        0.32        0.49
          Survey Rate |      6,792       67.92       68.41
       WAC Adjustment |      3,159       31.59      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 1 Mar 2018