control group

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Related to control condition: correlation

control group

[kən′trōl ‚grüp]
(statistics)
A sample in which a factor whose effect is being estimated is absent or is held constant, in order to provide a comparison.

control group

or

control condition

a group matched with the EXPERIMENTAL GROUP in all aspects except that it is not treated with the INDEPENDENT VARIABLE whose effect is to be studied. A control group is an essential part of EXPERIMENTAL METHOD design, since, unless a comparison is made between two groups, one having been subject to the variable and one not, it is difficult to conclude that any change is due to that variable. See also CONTROL, STATISTICAL.
References in periodicals archive ?
247, and between the love condition and the control condition, [M.
The mean estimates in the control condition were all less than the target distances (slope of the regression function = 0.
But the students chosen to receive the new curriculum might differ in a way that influences their academic Progress--they might, for instance, have had better reading teachers in the past, be more motivated, or have access to more educational resources at ho me, Randomly allocating students or multiple classrooms or multiple schools to the new reading program and to control conditions or to an alternative program eliminates the possibility that the two groups will differ in a systematic way and thus compromise the results.
Simple main effect analysis revealed that participants in the lack of control condition (M = 6.
The other session was a control condition similar in all respects, except that it did not involve exposure to the magnetic fields.
The estimated effect of the determination, which involves a major redesign of the previous price control conditions, will be that a domestic customer s annual bill will be reduced by approximately Au10 (before adjustments for inflation) by the end of the new price control period in September 2017.
RIGOROUS CONTROL CONDITIONS DIMINISH TREATMENT EFFECTS IN WEIGHT LOSS RANDOMIZED CONTROLLED TRIALS.
In both studies, the level of self-reported cognitive improvement rose significantly more after CBT than in the control conditions.
CES can effectively treat spinal, head, dental, and muscle pain and control conditions associated with pain (anxiety, depression, insomnia, and stress).
The researchers exposed female rats to low doses of MeHg, a PCB mixture, a combination of the two compounds, or control conditions starting 4 weeks prior to breeding and continuing through 16 days after birth Of offspring.
In a six-week experiment we examined plant biomass and succulence under oiled and control conditions.
In order to address several issues that arise when assessing levels of implementation while confirming differentiation between treatment and control conditions through the use of well-developed measures, fidelity data collected from a preschool curriculum intervention have been analyzed to demonstrate an example of: (1) Creating psychometrically strong, comprehensive fidelity measures that represent the critical components of an intervention; and (2) Using those measures to view fidelity as something beyond a unitary construct by differentiating implementation of instructional constructs and activities across conditions.