Frequencies for first 10,000 rows of rx4v1c2 variable in nhamcsopd2009 dataset :

   for rx4, |
 level 1 of |
multum drug |
category #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,649       96.49       96.49
        001 |         28        0.28       96.77
        040 |         58        0.58       97.35
        057 |         63        0.63       97.98
        081 |         82        0.82       98.80
        097 |         25        0.25       99.05
        105 |         14        0.14       99.19
        115 |          9        0.09       99.28
        122 |         29        0.29       99.57
        133 |         20        0.20       99.77
        218 |          1        0.01       99.78
        242 |          7        0.07       99.85
        254 |          2        0.02       99.87
        331 |          1        0.01       99.88
        358 |         12        0.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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