A floor effect in multi-item outcome measures occurs when most people choose the lowest possible scoring response on an item. A ceiling effect is most people choosing the highest scoring option. A floor response leaves no scope to record improvement on that item and a ceiling response leaves no room to show deterioration. Both limit the Variance of scores.
Try also … #
Chapters #
Nothing here yet!
Online applications #
At some point: online form which would flag up these effects for items.
