Frequencies for first 10,000 rows of ab_anti variable in natlterr2011 dataset :

Antibiotics |
        RFP |
632=f_ab_an |
    tibio R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,536       25.36       25.36
          N |      5,835       58.35       83.71
          U |      1,094       10.94       94.65
          Y |        535        5.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015