Frequencies for first 10,000 rows of sbunit_sw variable in pos2012 dataset :

    Subunit |
     Switch |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,520       15.20       15.20
          N |      8,314       83.14       98.34
          Y |        166        1.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016