Frequencies for first 10,000 rows of drg8ing2 variable in nhamcsed2005 dataset :

                             ing. #2 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                            levodopa |          1        0.01        0.01
                         triamterene |          1        0.01        0.02
              hydrocodone bitartrate |          4        0.04        0.06
                   ampicillin sodium |          1        0.01        0.07
                       oxycodone hcl |          1        0.01        0.08
               clavulanate potassium |          1        0.01        0.09
                                   . |      9,991       99.91      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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