Frequencies for first 10,000 rows of prescr2 variable in namcs2002 dataset :

 Prescription status |
 code for medication |
                  #2 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   Prescription drug |      2,992       29.92       29.92
Nonprescription drug |        298        2.98       32.90
        Undetermined |        235        2.35       35.25
                   . |      6,475       64.75      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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