Frequencies for first 10,000 rows of dechal variable in drug2017q1 dataset :

Dechallenge |
      code, |
 indicating |
if reaction |
abated when |
       drug |
therapy was |
    stopped |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      5,137       51.37       51.37
          D |      1,278       12.78       64.15
          N |        182        1.82       65.97
          U |      2,513       25.13       91.10
          Y |        890        8.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Sep 2017