. A logical or mathematical model of an AXIOM SYSTEM, or of a sentence in an axiom system, is a set of entities, which may be numbers or classes and hence abstract, whose relations can be represented by that system or sentence. A structure of such...

1 Generally, a (formal) representation in scientific studies of important structural and functional properties of the real world based on abstraction and idealization. Based on the analogy between models and some aspects of the object of study,...

An ALGORITHM that allows analysis of a problem to be undertaken using data as a proxy for real life. Ideally the model will contain all the information that is relevant to the problem but exclude that which is irrelevant. In practice models are often...

An empirical economic model based on case studies rather than on a priori assump tions such as those of rational choice theory By a process of induction themes emerge to reveal the unity of part of the economic system. These models aim to produce...

A model is a pattern, plan, representation (especially in miniature), or description designed to show the structure or workings of an object, system, or concept. Model may also refer to: Abstractions, concepts, and...

In today's investment world, financial models are all the rage. Planners use models to construct "optimal" portfolios. Stock analysts model a company's earnings. And the vaunted "Fed Model" tells us what a fair price is for the S&P 500. Unfortunately, excessive reliance...

I don't think I'd be interested in writing to a model because it doesn't really interest me (their life). Plus, even if I did want to know what a model did, how would this fake model be able to tell me? I think that...

Climate Change: It turns out that the global warming theorists have missed on another of their predictions. Shouldn't that be a deeply harmful, if not fatal, blow to the credibility of their argument?For years some climatologists have said that global warming would actually cause northwest...

The Ralph Lauren model Filippa Hamilton has bought a duplex on the 10th and 11th floors of the Urban Glass House, the last residential commission of the late Philip Johnson. But this newest buyer has more inviting cladding—which is why she’s been the face of...