Frequencies for first 10,000 rows of orthpdc_srgry_sw variable in pos1994 dataset :

      spec: |
 orthopedic |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,575       95.75       95.75
          N |        244        2.44       98.19
          Y |        181        1.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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