Category Component 25.3
Category Component Help

# BIAS

The `BIAS` field specifier (case sensitive) allows you to bias the score of results at query time according to the numerical proximity of the specified field to a given value.

NOTE: You can optimize the speed of this field specifier by restricting the field to the `NumericType` property type.

## Format

    FieldText=BIAS{optimum,range,percentage}:yourField

`optimum` | The value that `yourFields` must contain to increase or decrease the weight by the maximum percentage.
`range` | A positive number that determines the range of the specified optimum value. If the specified field contains a value that is in the range of (optimum - range) to (optimum + range), the weight is increased or decreased according to the specified percentage.
`percentage` | A percentage in the range 100 to -100. If the value of the specified field is within the specified range, the score of the result is increased or decreased according to how close the value is to the specified optimum. NOTE: When `AbsWeight` is set to `true`, this is the absolute value by which to boost the weight and it is then not limited by +/- 100.
`yourField` | A field name. A document has its score boosted if it contains this field, and if this field contains a number within the specified range of the optimum value.

## Example

    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%` if the price is `100`, to `0%` if the price is `50` or `150`.

    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%` if the price is `100`, to `-0%` if the price is `50` or `150`.

    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%` if the date is `1103918400`, to `0%`, if the date is `1103659200` or `1104177600`.

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Version 25.3 | Last updated July 2025

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Product: Knowledge Discovery Category Component 25.3

Topic Title: BIAS