Frequencies for first 10,000 rows of tc1s1_2 variable in h68f4 dataset :

     MULTUM |
  THERAPEUT |
SUB-SUB-CLA |
     SS FOR |
      TC1S1 |      Freq.     Percent        Cum.
------------+-----------------------------------
         -1 |      9,994       99.94       99.94
        143 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Feb 2018