Frequencies for first 10,000 rows of drug6cl3 variable in nhamcsed2002 dataset :

   drug6cl3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,980       99.80       99.80
       1374 |          1        0.01       99.81
       1568 |          1        0.01       99.82
       1728 |         13        0.13       99.95
       1944 |          2        0.02       99.97
       1945 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016