The phrase "are predominantly based" is correct and usable in written English.
It can be used to describe the primary foundation or source of something, often in academic or analytical contexts.
Example: "The conclusions of the study are predominantly based on the data collected over the past five years."
Alternatives: "are mainly derived" or "are primarily founded".
The contributing authors are predominantly based in the United States; consequently, there is a bias towards North American-based practice.
The reason for that is that areas of public life - such as politics and journalism - are predominantly based in London, which is an increasingly expensive place to live.
Fuller's has also concentrated on introducing a food-led concept and its pubs are predominantly based in affluent areas; nearly 50 per cent are within the M25.
Tan Hwee Koon, the curator of the exhibition, said that Mr. Li's sculptures are predominantly based on the artist's study of Buddhism and Taoist philosophies, which he combines by injecting the Buddhist concept of emptiness and the Taoist concept of chi, or energy.
To date, the published data are predominantly based on observational trials and small case series [8].
Current existing dermal exposure assessment strategies are predominantly based on regulatory protocols.
These carbon-related reporting and labeling activities are predominantly based on the methodology of life-cycle assessment (ISO 14044 [2006]).
Concepts of stability in a structural analysis and design are predominantly based on the behavior of single members, where the behavior is often relatively simple.
Research efforts are predominantly based on lab and pilot-scale experiments to select solvents and process systems which improve the overall performance of this technology.
But, very few natural polymer ceramic composites are available as commercial products, and those few are predominantly based on type I collagen.
Current industrial control system architectures are predominantly based on networked digital computers that enable reliable monitoring and control of critical functions via localized and distributed operations.
