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

    Autopsy |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      7,011       70.11       70.11
          U |      2,503       25.03       95.14
          Y |        486        4.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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