Frequencies for first 10,000 rows of urlgy_srgry_sw variable in pos2003 dataset :

      spec: |
    urology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,140       91.40       91.40
          N |        610        6.10       97.50
          Y |        250        2.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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