Frequencies for first 10,000 rows of mlt_site_excptn_sw variable in posclia2018 dataset :

   Multiple |
       Site |
Certificate |
  Indicator |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,617       96.17       96.17
          Y |        383        3.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Feb 2019