The phrase "a group of control" is not correct in standard written English.
It seems to be an incomplete or incorrect expression, possibly intended to refer to a "control group" in a scientific context.
Example: "In the experiment, we compared the results of the treatment group to a control group."
Alternatives: "a control group" or "a set of controls".
In a study published in Social Psychology and Personality Science, Kendall J. Eskine had people look at organic foods, comfort foods or a group of control foods.
In a 1997 PET scan study of murderers, for example, Dr. Raine and his colleagues found abnormalities in the functioning of the prefrontal cortex compared with a group of control subjects.
Researchers put the mental athletes and a group of control subjects into f.M.R.I. scanners and asked them to memorize three-digit numbers, black-and-white photographs of people's faces and magnified images of snowflakes as their brains were being scanned.
A group of control animals were treated identically but without injection of faecal slurry.
The goal of an experiment for achieving robustness is to separate the control factors into three groups: (1) a group of control factors whose different settings give rise to different average responses, (2) a group of control factors that are active by virtue of having an interaction with noise factors, and (3) a group of control factors that have no effect on the response.
To compare corneal biomechanical properties measured with Corvis Scheimpflug technology (Corvis ST) between a group of patients with chronic open-angle glaucoma and a group of control patients.
No oxygen treatment was given to a group of controls (n = 8).
Blood donors for neutrophil experiments belong to a group of controls of an ongoing study (STDF, 1814) approved by the research ethics committee of Cairo University.
In a case-control study, a sample of cases is compared with a group of controls who do not have the outcome of interest.
A sub-sample comprised of 2,000 randomly selected individuals with KC matched 1 1 on gender and 5-year age categories, to a group of controls.
The first round of the EBS has been conducted during intakes 4 and 5 (at the same time, the EBS was also administered to a group of controls).
