Frequencies for first 10,000 rows of drug4cl3 variable in nhamcsed2002 dataset :

   drug4cl3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,937       99.37       99.37
       0915 |          2        0.02       99.39
       1374 |          6        0.06       99.45
       1567 |          2        0.02       99.47
       1728 |         23        0.23       99.70
       1940 |          1        0.01       99.71
       1944 |         24        0.24       99.95
       1945 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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