Ceiling effect (statistics)

{The ceiling effect is one type of scale attenuation effect; the other scale attenuation effect is the floor effect.

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The ceiling effect is observed when an independent variable no longer has an effect on a dependent variable, or the level above which variance in an independent variable is no longer measurable.
The specific application varies slightly in differentiating between two areas of use for this term: pharmacological or statistical.
An example of use in the first area, a ceiling effect in treatment, is pain relief by some kinds of analgesic drugs, which have no further effect on pain above a particular dosage level (see also: ceiling effect in pharmacology).

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