Frequencies for first 10,000 rows of drg1ing5 variable in nhamcsed2003 dataset :

  ingredient code #5 for medication |
                                 #1 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                         sodium ion |         15        0.15        0.15
                          vitamin a |         12        0.12        0.27
                 potassium chloride |          1        0.01        0.28
                      magnesium ion |          3        0.03        0.31
                hyoscyamine sulfate |          1        0.01        0.32
                   neomycin sulfate |          1        0.01        0.33
                                  . |      9,967       99.67      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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