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

Antibiotics |
for Newborn |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,594       95.94       95.94
          U |        269        2.69       98.63
          Y |        137        1.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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