Frequencies for first 10,000 rows of drug3cl3 variable in nhamcsed2002 dataset :

   drug3cl3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,884       98.84       98.84
       0915 |          1        0.01       98.85
       1275 |          1        0.01       98.86
       1374 |         20        0.20       99.06
       1568 |          2        0.02       99.08
       1569 |          1        0.01       99.09
       1728 |         32        0.32       99.41
       1940 |          2        0.02       99.43
       1944 |         46        0.46       99.89
       1945 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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