Frequencies for first 10,000 rows of injwork variable in mort2006 dataset :

  Injury at |
       Work |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |        396        3.96        3.96
          U |      9,586       95.86       99.82
          Y |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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