Skillet (band) for highest-charting Christian album on the "Billboard" 200 with Underoath's 2006 release "Define the Great Line" and Casting Crowns' 2007 release "The Altar and the Door", as all three albums debuted at No. 2. Skillet was nominated for six Dove Awards for the 41st Annual GMA Dove Awards. "Awake" was certified gold July 2, 2010. Also in 2010, Ardent released "The Early Years", a collection of their songs from 1996 to 2001. On November 12, Skillet released an iTunes sessions EP consisting of songs from "Comatose" and "Awake". "Monster" was certified gold a day later. On February 14, 2011, 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