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

 Anesthesia |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      5,761       57.61       57.61
          U |         63        0.63       58.24
          Y |      4,176       41.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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