Savior (Skillet song) Savior (Skillet song) "Savior" is the third single from the Christian rock band Skillet's fifth studio album, "Collide". It has been to date the band's fifth highest mainstream rock "Billboard" charting single, peaking at No. 26. The song is on the Digital Praise PC game Guitar Praise. Savior peaked at No. 26 on the Billboard rock charts and No. 21 on the ChristianRock.net Annual Top 100. The music video shows the band playing in both a house and at a park at night. It became only the second Skillet video to have a story in the video, after "Best Kept
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