Collide (Skillet album) Collide (Skillet album) Collide is the fifth full-length album by Christian rock band Skillet. It was originally released on November 18, 2003 under Ardent Records. The album was re-released through Lava Records on May 25, 2004 with the bonus track "Open Wounds". The album peaked at No. 179 on the "Billboard" 200 and No. 5 on the Top Heatseekers. The album artwork is, according to John Cooper, faith and fear colliding. This is also Skillet's first full album to feature Ben Kasica on lead guitar. A video was made for the song "Savior". The music video shows the band playing
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