The phrase "are based on theoretical" is not complete and lacks context, but it is grammatically correct.
You can use it when discussing concepts, models, or frameworks that derive from theoretical foundations.
Example: "The findings of this study are based on theoretical principles established in previous research."
Alternatives: "are grounded in theory" or "are founded on theoretical concepts."
Most therapists reported the routine use of flexion-based exercise, reflecting recommendations in the literature which are based on theoretical benefits, but for which trial evidence is lacking.
A number of specific technical approaches for the development of SQGs that are based on theoretical and empirical foundations have been proposed, including effects-based correlative approaches, equilibrium partitioning, and consensus using a combination of approaches.
This paper describes a fluidised bed model developed from the DEM-based Aston granular dynamics code in which the solid solid interaction rules are based on theoretical contact mechanics thereby enabling particles to be directly specified by material properties such as friction, elasticity, elasto-plasticity and auto-adhesion.
The transformation algorithms are based on theoretical fundaments [ 17] and on previous research in which one or more valuation techniques (i.e. Standard Gamble (SG), Time Trade-Off (TTO), and Rating Scale (RS)) [ 13] were used to measure directly the preferences of individuals (usually from community surveys) for different "health profiles".
These petrophysical models are based on theoretical approaches and laboratory measurements and aim to improve the interpretation of geophysical data.
However, most of these studies are based on theoretical models and simulation analysis of assumed hardware imperfections without experimental verification.
The hybrid circuit, built with transistors on a chip, is based on theoretical models of the brain as well as on empirical results of animal studies.
Administration officials said that some of the national laboratories' studies were based on theoretical assumptions that do not translate well into policy.
The study is based on theoretical deliberations.
This study is based on theoretical reasoning and empirical data.
