Frequencies for first 10,000 rows of toxclgy variable in person dataset :

 Drug Noted |
         in |
 Toxicology |
     Report |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,425       54.25       54.25
          1 |      1,417       14.17       68.42
          2 |        184        1.84       70.26
          3 |        714        7.14       77.40
          7 |          4        0.04       77.44
          8 |      1,817       18.17       95.61
          9 |        439        4.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016