Skillet (band) Kutless, Hawk Nelson, Disciple, Decyfer Down, and others. Skillet also played at the Super Dome in New Orleans for the ELCA National Youth Gathering in 2009. Skillet headlined two separate Rock the River tours, run by the Billy Graham Evangelistic Association, and hosted by Franklin Graham. Those tours were Rock the River: Midwest in the summer of 2009 and Rock the River: West in the summer of 2010. In January 2010, they toured with Puddle of Mudd and Shinedown through the East Coast of the United States. They also announced on their live chat with fans on December 5, 2009
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