Skillet (band) and My Darkest Days will be supporting acts. They toured again with TobyMac in November and December as the 2010 version of the Winter Wonder Slam tour. On July 4, Skillet played at Creation Festival East, and John Cooper called it the best show of Skillet's career. In January 2011, Skillet confirmed that they would be touring with Stone Sour and Theory of a Deadman on the Avalanche Tour. The tour began at the end of March 2011 and concluded on May 8 in Jacksonville, FL. Other supporting acts include Halestorm and Art of Dying. The band had a small
Differential item functioning Differential item functioning Differential item functioning (DIF) is a statistical characteristic of an item that shows the extent to which the item might be measuring different abilities for members of separate subgroups. Average item scores for subgroups having the same overall score on the test are compared to determine whether the item is measuring in essentially the same way for all subgroups. The presence of DIF requires review and judgment, and it does not necessarily indicate the presence of bias. DIF analysis provides an indication of unexpected behavior of items on a test. An item does not display DIF if