Frequencies for first 10,000 rows of mlt_site_excptn_sw variable in posclia2011

   Multiple |
       Site |
Certificate |
     Switch |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,704       97.04       97.04
          Y |        296        2.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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