Frequencies for first 10,000 rows of rx2v1c2 variable in namcs2009 dataset :

   for rx2, |
 level 1 of |
multum drug |
category #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,413       94.13       94.13
        001 |         29        0.29       94.42
        040 |        107        1.07       95.49
        057 |        124        1.24       96.73
        081 |        132        1.32       98.05
        097 |         29        0.29       98.34
        105 |         36        0.36       98.70
        113 |          1        0.01       98.71
        115 |         14        0.14       98.85
        122 |         56        0.56       99.41
        133 |         23        0.23       99.64
        218 |          4        0.04       99.68
        242 |          1        0.01       99.69
        254 |          2        0.02       99.71
        358 |         28        0.28       99.99
        899 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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