Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd1993 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,250       12.50       12.50
          2 |        229        2.29       14.79
          3 |        209        2.09       16.88
          . |      8,312       83.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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