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

 Anesthesia |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      5,606       56.06       56.06
          U |         73        0.73       56.79
          Y |      4,321       43.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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