The phrase "are a specific group" is correct and usable in written English.
It can be used when defining or identifying a particular category or classification of people or things.
Example: "The researchers found that the participants in the study are a specific group of individuals who share similar characteristics."
Alternatives: "constitute a distinct group" or "represent a particular category".
Geomechanical rock properties are a specific group of petrophysical parameters, directly measured in rock mechanics laboratories or by specific field tests.
This could affect the generalizability of our data, in the sense that patients with a preference for jogging are a specific group of patients.
RGCs are a pivotal cell type in the developing CNS of all vertebrates and are a specific group of neural stem cells.
Our nursing home residents are a specific group of older persons, where a high number suffers from cognitive disorders as the primary diagnosis.
Miniature inverted-repeat transposable elements (MITEs) are a specific group of nonautonomous DNA transposons, and they are distributed in a wide range of hosts.
It should be noted that, because this study setting is rather specific and the participants relatively highly educated, the participants in this study are a specific group thereby making it difficult to generalize these results to other populations and to other settings.
But outside of Albarn and Hewlett's collaboration, Gorillaz have never been a specific group of players, or a particular style of performance.
Combustion is a specific group of chemical reactions where a fuel and oxygen burn together at sufficiently high temperature to evolve heat and combustion products.
For a successful valorization, there has to be a specific group of actors who believe in the worthiness of an invention and lobby for its societal usage.
It was a specific group of people.
The target group for the study was a specific group of chest physical therapists with post-graduate training in COPD.
