Frequencies for first 10,000 rows of prescr4 variable in namcs2002 dataset :

 Prescription status |
 code for medication |
                  #4 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   Prescription drug |      1,015       10.15       10.15
Nonprescription drug |        114        1.14       11.29
        Undetermined |         82        0.82       12.11
                   . |      8,789       87.89      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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