Frequencies for first 10,000 rows of dechal variable in drug2018q1 dataset :

Dechallenge |
      code, |
 indicating |
if reaction |
abated when |
       drug |
therapy was |
    stopped |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      5,121       51.21       51.21
          D |      1,229       12.29       63.50
          N |        131        1.31       64.81
          U |      2,562       25.62       90.43
          Y |        957        9.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Jun 2018