Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd1997 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,473       14.73       14.73
          2 |        245        2.45       17.18
          3 |        119        1.19       18.37
          . |      8,163       81.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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