Frequencies for first 10,000 rows of ld_antb variable in natl2015 dataset :

Antibiotics |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      7,746       77.46       77.46
          U |         63        0.63       78.09
          Y |      2,191       21.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016