Frequencies for first 10,000 rows of injwork variable in mortterr2007 dataset :

  Injury at |
       Work |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |        510        5.10        5.10
          U |      9,472       94.72       99.82
          Y |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015