Frequencies for first 10,000 rows of urlgy_srgry_sw variable in pos2005 dataset :

      spec: |
    urology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,323       93.23       93.23
          N |        451        4.51       97.74
          Y |        226        2.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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