Frequencies for first 10,000 rows of rx1v1c2 variable in nhamcsopd2009 dataset :

   for rx1, |
 level 1 of |
multum drug |
category #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,204       92.04       92.04
        001 |        106        1.06       93.10
        020 |          1        0.01       93.11
        040 |        106        1.06       94.17
        057 |        101        1.01       95.18
        081 |        101        1.01       96.19
        087 |          1        0.01       96.20
        097 |        126        1.26       97.46
        105 |         52        0.52       97.98
        113 |          2        0.02       98.00
        115 |         48        0.48       98.48
        122 |         73        0.73       99.21
        133 |         39        0.39       99.60
        218 |          3        0.03       99.63
        242 |          6        0.06       99.69
        254 |         13        0.13       99.82
        358 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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