Before revision: Based on the temporal distributions of clustered segments in the time series of the ten Dow Jones US (DJUS) economic sector indices, we calculated their cross correlations over the period February 2000 to August 2008, the two-year intervals 2002--2003, 2004--2005, 2008--2009, and also over 11 corresponding segments within the present financial crisis . From these cross-correlation matrices, we constructed minimal spanning trees (MSTs) of the US economy at the sector level.
After revision: Based on the temporal distributions of clustered segments in the time series of the ten Dow Jones US (DJUS) economic sector indices, we calculated their cross correlations over the period February 2000 to August 2008, the two-year intervals 2002--2003, 2004--2005, 2008--2009, and also over 11 corresponding segments within the present financial crisis , to construct minimal spanning trees (MSTs) of the US economy at the sector level.