In statistics, a floor effect (also known as a basement effect) arises when a data-gathering instrument has a lower limit to the data values it can reliably specify.[1] This lower limit is known as the "floor".[2] The "floor effect" is one type of scale attenuation effect;[3] the other scale attenuation effect is the "ceiling effect". Floor effects are occasionally encountered in psychological testing, when a test designed to estimate some psychological trait has a minimum standard score that may not distinguish some test-takers who differ in their responses on the test item content.[4] Giving preschool children an IQ test designed for adults would likely show many of the test-takers with scores near the lowest standard score for adult test-takers (IQ 40 on most tests that were currently normed as of 2010). To indicate differences in current intellectual functioning among young children, IQ tests[5] specifically for young children are developed, on which many test-takers can score well above the floor score. An IQ test designed to help assess intellectually disabled persons might intentionally be designed with easier item content and a lower floor score to better distinguish among individuals taking the test as part of an assessment process.[6]
^Lim, Christopher R.; Harris, Kristina; Dawson, Jill; Beard, David J.; Fitzpatrick, Ray; Price, Andrew J. (2015-07-01). "Floor and ceiling effects in the OHS: an analysis of the NHS PROMs data set". BMJ Open. 5 (7): e007765. doi:10.1136/bmjopen-2015-007765. ISSN 2044-6055. PMC 4521553. PMID 26216152.
^Stephanie (2017-09-10). "Floor Effect / Basement Effect: Definition". Statistics How To. Retrieved 2020-04-14.
^"Scale Attenuation Effect - SAGE Research Methods". methods.sagepub.com. Retrieved 2020-10-22.
^Zhu, Leina; Gonzalez, Jorge (2017). "Modeling Floor Effects in Standardized Vocabulary Test Scores in a Sample of Low SES Hispanic Preschool Children under the Multilevel Structural Equation Modeling Framework". Frontiers in Psychology. 8: 2146. doi:10.3389/fpsyg.2017.02146. ISSN 1664-1078. PMC 5732956. PMID 29312033.
^Sansone, Stephanie M; Schneider, Andrea; Bickel, Erika; Berry-Kravis, Elizabeth; Prescott, Christina; Hessl, David (2014). "Improving IQ measurement in intellectual disabilities using true deviation from population norms". Journal of Neurodevelopmental Disorders. 6 (1): 16. doi:10.1186/1866-1955-6-16. ISSN 1866-1947. PMC 4613563. PMID 26491488.
^"IQ testing in individuals with intellectual disability". health.ucdavis.edu. Retrieved 2020-04-14.
as the "floor". The "flooreffect" is one type of scale attenuation effect; the other scale attenuation effect is the "ceiling effect". Floor effects...
Wet floor may refer to: Wet floor sign Wet flooreffect This disambiguation page lists articles associated with the title Wet floor. If an internal link...
fourteenth floors. This effect, however, was eliminated if developers offered buyers a 10% or greater discount on the cost of thirteenth-floor apartments...
the conversion process. Floor toms are also used in music parades, often being carried and then lifted up and hit to add effect. It can also be used as...
In architecture, construction, and real estate, floor area, floor space, or floorspace is the area (measured as square feet or square metres) taken up...
floor The sound of a person walking on the "nightingale floor" of Daikaku-ji in Kyoto. Problems playing this file? See media help. Nightingale floors...
to the stack effect, while interior partitions, floors, and fire separations can mitigate it. Especially in case of fire, the stack effect needs to be...
older adults who live independently in the community. A ceiling effect and flooreffect has been reported for the BBS when used with community dwelling...
laminated side to side. The effect is a lined, almost uniform look to the surface of the finished floor plank. In horizontal bamboo floors, the slats are arranged...
takes one to three months to begin to have an effect. Kegel exercises aim to strengthen the pelvic floor muscles. These muscles have many functions within...
aged 16 can complete the WISC-V or the WAIS-IV. Different flooreffect and ceiling effect can be achieved using the different tests, allowing for a greater...
The Tetris effect occurs when someone dedicates vast amounts of time, effort and concentration on an activity which thereby alters their thoughts, experiences...
effects model Fixed-effect Poisson model FLAME clustering Fleiss' kappa Fleming–Viot process Flood risk assessment Flooreffect Focused information criterion...
Pelvic floor dysfunction is a term used for a variety of disorders that occur when pelvic floor muscles and ligaments are impaired. The condition affects...
Floor area ratio (FAR) is the ratio of a building's total floor area (gross floor area) to the size of the piece of land upon which it is built. It is...
price floor set below the free-market price. In this case, the floor has no practical effect. The government has mandated a minimum price, but the market...
lighting formed the basis of the Hawthorne effect, other changes such as maintaining clean work stations, clearing floors of obstacles, and even relocating workstations...
A sprung floor is a floor that absorbs shocks, giving it a softer feel. Such floors are considered the best kind for dance and indoor sports and physical...
women themselves. In addition, women experience a "sticky flooreffect". The sticky flooreffect happens when women have no job path or ladder to higher...
Institute in Zürich in 1948. A famous Pauli effect at the ceremony—as he entered, a china flower vase fell on the floor without any obvious reason—caused Pauli...
can be corrected or regulated with floor heating and cooling systems. Underfloor heating can have a positive effect on the quality of indoor air by facilitating...
have an extensive effect on marketing and consumer decisions. For example, research has shown that the comfort level of the floor that shoppers are standing...
Killing Floor 2 is a first-person shooter video game developed and published by Tripwire Interactive, with later support from Saber Interactive. It is...
crust is based on their modes of formation. Oceanic crust is formed at sea-floor spreading centers. Continental crust is formed through arc volcanism and...
Global Information