Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd1995 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,709       27.09       27.09
          2 |        528        5.28       32.37
          3 |        314        3.14       35.51
          . |      6,449       64.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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