Frequencies for first 10,000 rows of rx5v3c2 variable in nhamcsopd2006 dataset :

        for rx5, level 3 of multum drug |
                            category #2 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                      . |     10,000      100.00      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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