Community Component 25.2
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# Use the BIAS Field Specifier to Boost Relevance

The BIAS field specifier allows you to bias the score of results at query time according to the numerical proximity of the specified field to a particular value. It ignores initial dollar ($), pound sign (£), or hyphen (–) characters in the field names.

Specify `BIAS` in the format:

    BIAS{optimum,range,percentage}

where:

`optimum` | is the value that the field must contain to increase or decrease the result weight by the maximum `percentage`.
`range` | is a positive number that determines the range of the `optimum`. If the specified field contains a value that is in the range of (`optimum` – `range`) to (`optimum` + `range`), the result weight increases or decreases according to the specified `percentage`.
`percentage` | is a percentage in the range`–100` to `100`. If the value of the specified field is in the specified range, the score of the result increases or decreases according to how close the value is to the specified `optimum`.

For example:

-     http://ContentHost:port/action=Query&FieldText=BIAS{100,50,10}:*/PRICE

  A document whose `PRICE` field value is within the range 50 either side of 100 has its weight increased on a linear scale from 10 percent if the price is 100, to 0 percent if the price is 50 or 150:

-     http://ContentHost:port/action=Query&FieldText=BIAS{100,50,-10}:*/PRICE

  A document whose `PRICE` field value is within the range 50 either side of 100 has its weight decreased on a linear scale from –10 percent if the price is 100, to 0 percent if the price is 50 or 150:

- You can also use the `BIAS` field specifier to bias the score of results according to the numerical proximity in their `autn_date` metafield to a particular value. For example:

      FieldText=BIAS{1103918400,259200,25}:autn_date

  A document whose `autn_date` field value is within the range 259200 either side of 1103918400 has its weight increased on a linear scale from 25 percent if the price is 1103918400, to 0 percent, if the date is 1103659200 or 1104177600.

Related Topics

- Metadata Fields

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Version 25.2 | Last updated April 2025

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Product: Knowledge Discovery Community Component 25.2

Topic Title: Use the BIAS Field Specifier to Boost Relevance