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

 Drug Noted |
         in |
 Toxicology |
     Report |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,283       52.83       52.83
          1 |      1,634       16.34       69.17
          2 |        181        1.81       70.98
          3 |        746        7.46       78.44
          7 |          9        0.09       78.53
          8 |      1,842       18.42       96.95
          9 |        305        3.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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