Frequencies for first 10,000 rows of prescr1 variable in nhamcsed2000 dataset :

prescriptio |
   n status |
   code for |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,650       46.50       46.50
          2 |      1,330       13.30       59.80
          3 |      1,075       10.75       70.55
          . |      2,945       29.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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