Skillet (band) member remaining in the band. They are known for a relentless touring schedule, which garnered them a top five ranking in the Hardest Working Bands of 2010 by Songkick.com. Skillet formed in 1996 with two members: John Cooper, former vocalist for Tennessee progressive rock band Seraph, and Ken Steorts, former guitarist for Urgent Cry. The two bands met through touring together, but those bands disbanded soon after, so John and Ken's pastor encouraged them to form their own band as a side-project. They decided to name the experiment 'Skillet'. After, Trey McClurkin joined the band as a temporary drummer. Skillet
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