MEANING
Concentration of scores at an instrument’s lower limit, restricting its ability to distinguish lower levels or changes.
Use it for
Use for lower-bound compression in a test, scale, or other bounded measure.Identify when a test or measure cannot distinguish low performers or small declines.
Words that belong together
- floor effect on a test
- floor effect in a scale
- avoid a floor effect
On the page
Most beginners scored at zero, so a floor effect obscured small improvements.
Word forms
- Base
- floor effect
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Usage notes
Occurs when an instrument’s lower bound compresses low scores; it can hide differences or improvement below that threshold.
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