Frequencies for first 10,000 rows of prescr1 variable in nhamcsopd1992 dataset :

Prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,777       37.77       37.77
          2 |        579        5.79       43.56
          3 |        658        6.58       50.14
          . |      4,986       49.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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