Frequencies for first 10,000 rows of prescr1 variable in namcs2002 dataset :

 Prescription status |
 code for medication |
                  #1 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   Prescription drug |      5,306       53.06       53.06
Nonprescription drug |        408        4.08       57.14
        Undetermined |        383        3.83       60.97
                   . |      3,903       39.03      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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