Frequencies for first 10,000 rows of drug5cl3 variable in nhamcsed2002 dataset :

   drug5cl3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,961       99.61       99.61
       0915 |          3        0.03       99.64
       1268 |          1        0.01       99.65
       1374 |          4        0.04       99.69
       1728 |         20        0.20       99.89
       1940 |          1        0.01       99.90
       1944 |          4        0.04       99.94
       1945 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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