Frequencies for first 10,000 rows of drug2cl3 variable in nhamcsed2002 dataset :

   drug2cl3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,784       97.84       97.84
       1374 |         24        0.24       98.08
       1567 |          7        0.07       98.15
       1568 |          7        0.07       98.22
       1569 |          1        0.01       98.23
       1728 |         50        0.50       98.73
       1940 |          8        0.08       98.81
       1943 |          1        0.01       98.82
       1944 |        101        1.01       99.83
       1945 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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