Frequencies for first 10,000 rows of drg5ing5 variable in nhamcsed2005 dataset :

                             ing. #5 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                          sodium ion |          1        0.01        0.01
                           vitamin a |          1        0.01        0.02
                           vitamin c |          1        0.01        0.03
                            vanadium |          1        0.01        0.04
                                   . |      9,996       99.96      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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