Frequencies for first 10,000 rows of ld_antb variable in natlterr2014 dataset :

Antibiotics |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      7,314       73.14       83.91
          U |        157        1.57       85.48
          Y |      1,452       14.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016