Frequencies for first 10,000 rows of drg1ing4 variable in nhamcsed2003 dataset :

  ingredient code #4 for medication |
                                 #1 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                 magnesium antacids |          1        0.01        0.01
                      potassium ion |         15        0.15        0.16
                         sodium ion |          3        0.03        0.19
                     sodium sulfate |          1        0.01        0.20
                           thiamine |         12        0.12        0.32
                      water sterile |          1        0.01        0.33
                   atropine sulfate |          2        0.02        0.35
                  codeine phosphate |          1        0.01        0.36
             hydrocortisone acetate |          1        0.01        0.37
                hyoscyamine sulfate |          7        0.07        0.44
               dextromethorphan hbr |          2        0.02        0.46
                diphenhydramine hcl |          1        0.01        0.47
                                  . |      9,953       99.53      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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