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

 spec: oral |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,666       96.66       96.66
          N |        246        2.46       99.12
          Y |         88        0.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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