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A rule that stipulates when a security should be bought or sold according to its price action.

Filter Rule

In technical analysis, an arbitrarily set percentage of increase or decline in a stock's price that the analyst sees as an indicator to buy or sell the stock. For example, the analyst may set his/her own filter rule at 15%. If the stock rises 15%, the analyst recommends buying; if it falls 15%, he/she recommends selling. While the particular percentage is subjective, one arrives at it by observing the stock's historical trends. The filter rule exists to help the investor avoid buying or selling at insignificant or anomalous changes in price. However, many analysts do not believe that the filter rule consistently produces profits for the investor.
References in periodicals archive ?
The Vis Optical Filter is available to customers worldwide now.
A reverse osmosis plant from ELGA Process Water proved a cost effective solution when Optical Filters experienced production problems with their optical screen meshes.
The new film can also be used with optical filters based on a glass substrate.
The "Precision Optical Filters for Fluorescence Microscopy" catalog includes a number of new filter sets that Omega Optical has added to its product line.
Strong sales of touch screen products and optical filters for electronic displays also helped push turnover up 12pc to pounds 5.
Established in Yokohama, Japan, in 1980, Koshin Kogaku manufactures fiber optics devices ranging from tunable filters to external cavity laser light sources, and a wide range of optical filters that are based and developed on thin-film technology.
These materials selfassemble to form spatial patterns that exhibit technologically useful optical properties for optical filters, couplers, and switches.
Comprised of an advanced tunable laser source (TLS), optical power meter, high sensitivity sensor and control software, the system features exceptional dynamic range, allowing it to conduct accurate analysis of optical filters, couplers, isolators and splitters during R&D and manufacturing.
By controlling such factors as hole spacing, comments Roy Sambles of the University of Exeter in England, it may be possible to create optical filters that selectively transmit certain wavelengths with no diffractive effects.
Debuting to raves at the annual meeting of the American Society of Human Genetics conference in Baltimore, the PowerGene M-FISH reportedly uses fluorescent reagents and optical filters to automatically analyse chromosomes like no one's ever automatically analysed them before.

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