Frequencies for first 10,000 rows of ld_antb variable in natl2017 dataset :

Antibiotics |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      7,830       78.30       78.30
          U |         31        0.31       78.61
          Y |      2,139       21.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018