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Field Specifiers to Bias Result Scores
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BIAS. The BIAS field specifier (case sensitive) allows you to bias the score of results according to the numerical proximity of the specified field to a given value.
You can also boost the percentage relevance that is given to query results by setting up specific field process or by using multipliers. See Manipulate Result Relevance for details on BIAS and other methods that allow you to manipulate result scores.
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BIASDATE. The BIASDATE field specifier (case sensitive) allows you to boost the score of result documents by a specified percentage, based on how close the date in a specified field is to a specified date.
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BIASDISTCARTESIAN. The BIASDISTCARTESIAN field specifier allows you to boost the score of any document according to its distance from a specified point using Cartesian coordinates (X/Y).
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BIASDISTSPHERICAL. The BIASDISTSPHERICAL field specifier allows you to boost the score of any document according to its distance from a specified point using spherical coordinates (latitude/longitude).
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BIASVAL. The BIASVAL field specifier (case sensitive) allows you to bias the score of result documents by a specified percentage, based on whether they include a specific value in the specified field.