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

      spec: |
   thoracic |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,323       93.23       93.23
          N |        637        6.37       99.60
          Y |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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