Frequencies for first 10,000 rows of ab_anti variable in natlterr2007 dataset :

Antibiotics |
        RFP |
632=f_ab_an |
    tibio R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,163       61.63       61.63
          N |      3,420       34.20       95.83
          U |          1        0.01       95.84
          Y |        416        4.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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