Frequencies for first 10,000 rows of ld_anes variable in natl2013 dataset :

 Anesthesia |
        RFP |
616=f_ld_an |
     esth R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      6,291       62.91       62.91
          U |        153        1.53       64.44
          Y |      3,556       35.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015