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# 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}:yourFields

`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.
`yourFields` | One or more fields. A document has its score boosted if it contains one of these fields, and if this field contains a number within the specified range of the optimum value. Separate multiple fields with colons (`:`). There must be no space before or after a colon.

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

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