Frequencies for first 10,000 rows of prescr4 variable in nhamcsopd1996 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,038       10.38       10.38
          2 |        170        1.70       12.08
          3 |         83        0.83       12.91
          . |      8,709       87.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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