Frequencies for first 10,000 rows of ld_anes variable in natlterr2014 dataset :

 Anesthesia |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      7,689       76.89       87.66
          U |        157        1.57       89.23
          Y |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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