Frequencies for first 10,000 rows of paydk variable in namcs2011 dataset :

    Unknown |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,628       96.28       96.28
        Yes |        372        3.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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