Frequencies for first 10,000 rows of orthpdc_srgry_sw variable in pos2007 dataset :

      spec: |
 orthopedic |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,666       96.66       96.66
          N |        201        2.01       98.67
          Y |        133        1.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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