Frequencies for first 10,000 rows of unioncov variable in morg08 dataset :

 Covered by |
    a union |
   contract |      Freq.     Percent        Cum.
------------+-----------------------------------
        Yes |         73        0.73        0.73
         No |      4,628       46.28       47.01
          . |      5,299       52.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Mar 2017