Frequencies for first 10,000 rows of dechal variable in drug2017q3 dataset :

Dechallenge |
      code, |
 indicating |
if reaction |
abated when |
       drug |
therapy was |
    stopped |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,729       47.29       47.29
          D |      1,377       13.77       61.06
          N |        209        2.09       63.15
          U |      2,873       28.73       91.88
          Y |        812        8.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 Feb 2018