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)
“Because just as arms have no force outside if there is no counsel within a house, study is vain and counsel useless that is not put to virtuous effect when the time calls.”
—François Rabelais (1494–1553)