Egg (chair) at San Francisco International Airport features the Egg in its boarding area. Now there are hundreds of different types of egg chairs and hanging egg chairs inspired by Arne Jacobsen's design. The Hanging Egg Chair was designed by Danish furniture designers Nanna Ditzel and her husband Jørgen Ditzel in 1957 in Denmark and launched in 1959 in cooperation with the wicker company R. Wengler in Copenhagen. Since 2012 it is distributed by Sika Design.. The egg-shaped basket seat is made of woven natural rattan and suspended by a metal chain from above. Nanna Ditzel incorporated the minimalist visual elements that
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