The term ceiling effect has two distinct meanings, referring to the level at which an independent variable no longer has an effect on a dependent variable, or to the level above which variance in an independent variable is no longer measured or estimated. An example of the first meaning, 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. An example of the second meaning, a ceiling effect in data-gathering, is a survey that groups all respondents into income categories, not distinguishing incomes of respondents above the highest level asked about in the survey instrument.
Read more about Ceiling Effect: Treatment, Data-gathering
Famous quotes containing the words ceiling and/or effect:
“What made the ceiling waterproof?
Landor’s tarpaulin on the roof.”
—William Butler Yeats (1865–1939)
“The cities of the world are concentric, isomorphic, synchronic. Only one exists and you are always in the same one. It’s the effect of their permanent revolution, their intense circulation, their instantaneous magnetism.”
—Jean Baudrillard (b. 1929)