Purchase-Only Indexes Volatility (Estimated using Sales Price Data)http://fhfa.gov/Default.aspx?Page=87Sat, 25 May 2013 06:12:22 GMT720State Volatility Parameters through 2013Q1 [TXT]http://fhfa.gov/webfiles/25205/vol_13Q1_sales_S2.txtState Volatility Parameters through 2013Q1 [TXT]Thu, 23 May 2013 13:00:00 GMT23473State Volatility Parameters through 2013Q1 [XLS]http://fhfa.gov/webfiles/25206/vol_13Q1_sales_S2.xlsState Volatility Parameters through 2013Q1 [XLS]Thu, 23 May 2013 13:00:00 GMT23474