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

 Drug Noted |
         in |
 Toxicology |
     Report |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,461       54.61       54.61
          1 |      1,630       16.30       70.91
          2 |        217        2.17       73.08
          3 |        733        7.33       80.41
          7 |         14        0.14       80.55
          8 |      1,496       14.96       95.51
          9 |        449        4.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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