Frequencies for year variable in pchrr2003_2007 dataset :

   Year ( ( |
2007 + 2003 |
    ) / 2 ) |      Freq.     Percent        Cum.
------------+-----------------------------------
       2005 |        307      100.00      100.00
------------+-----------------------------------
      Total |        307      100.00

by Jean Roth , jroth@nber.org , 14 Mar 2018