Frequencies for first 10,000 rows of ld_antb variable in natl2014 dataset :

Antibiotics |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      7,812       78.12       78.12
          U |         73        0.73       78.85
          Y |      2,115       21.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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