Skillet (band) officially announced that longtime lead guitarist Ben Kasica would be leaving the band. Kasica was with the band for 10 years, contributing to the albums "Alien Youth", "Collide", "Comatose", and "Awake" as well as the live album "Comatose Comes Alive". He played what was planned to be his last concert with the band on March 20 but returned and continued touring until a new guitarist was trained. On April 16, Seth Morrison replaced Kasica as the lead guitarist, and now tours full-time with Skillet. Skillet announced the release of "Awake and Remixed EP" in early March 2011. The remixes were
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