V.9:2 (87-90): Fuzzy Expert Systems by J.F. Derry

V.9:2 (87-90): Fuzzy Expert  Systems by J.F. Derry
Item# \V09\C02\FUZZY.PDF
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Fuzzy Expert Systems by J.F. Derry

Expert systems give the technical analyst a potent set of tools to dissect trading and investment problems in short order.

For traders and investors alike, the real problem with both technical and fundamental methods is that of laying out current after-tax dollars in the expectation of future before-tax profits based solely upon the guidance of 20/20 hindsight generated through past experience. However investment and trading opportunities are analyzed, investment decisions should depend upon as large a body of expertise as possible. Such expertise can be captured in computer software in the form of an expert system, which may contain knowledge of fundamental or technical technique or both. Although many forms of expert systems can be (and have been) applied to securities trading and investment, for my purposes I am concentrating on a small but usable expert system based on fuzzy logic as a demonstration project and how to use fuzzy logic programming in everyday practice.


As originally stated by L.A. Zadeh, the concept of fuzzy logic was roughly as follows: If propositional logic is modified to permit use of any value in the range of 0 to 1 rather than only the "crisp" binary values of 0 and 1, then the resulting "fuzzy" logic should be able to accommodate linguistic information.

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