Frequencies for first 10,000 rows of prescr1 variable in namcs1995 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,151       61.51       61.51
          2 |        509        5.09       66.60
          3 |        628        6.28       72.88
          . |      2,712       27.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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