Frequencies for first 10,000 rows of urlgy_srgry_sw variable in pos2009 dataset :

      SPEC: |
    UROLOGY |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,644       96.44       96.44
          N |        235        2.35       98.79
          Y |        121        1.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017