Purchase Only Indexes Volatility (Estimated using Sales Price Data)http://www.fhfa.gov/Default.aspx?Page=87Sat, 18 May 2013 14:32:10 GMT720State Volatility Parameters through 2012Q4 [TXT]http://www.fhfa.gov/webfiles/24971/vol_12q4_sales_S2.txtState Volatility Parameters through 2012Q4 [TXT]Tue, 26 Feb 2013 14:00:00 GMT23282State Volatility Parameters through 2012Q4 [XLS]http://www.fhfa.gov/webfiles/24972/vol_12q4_sales_S2.xlsState Volatility Parameters through 2012Q4 [XLS]Tue, 26 Feb 2013 14:00:00 GMT23283