Ranking Tab

Site Search > Relevance > Relevance Modeling > Ranking Tab

---

The Ranking Tab of SearchStax Site Search solution’s Model Details screen lets us apply “boost” multipliers to relevance scores of result items that meet special criteria.

• Search Field: If there is a match within a specific field, boost the item’s relevance score.
• Field Value: If a field contains a specific value (whether matched or not), boost the item’s relevance score.
• Function: Boost the item’s relevance score based on a value returned by a function.

Note that you can turn the feature on and off using a checkbox. 

Slide the controls left and right to establish the relative importance of a match in each field. A default (unboosted) field has a boost multiplier of 1. 

Search Field

To boost an item when a match occurs within a specific field, select “Search Field” and choose the field from a list. Click the (+) button to create a slider control for that field. Use the slider to adjust the boost.

Field Value

To create a boost based on the presence of a specific field value in the result item, select the “Field Value” option and then fill in the field name and the desired value.

Function

To calculate a partial relevance score based on the value of a field, select the Function option and type in a Solr Function Query expression. Click the (+) button to create a slider control.

Some example functions you can use are:

1. To boost if the field ‘sitename’ contains ‘Public’: termfreq(sitename,'Public')
2. To boost by a date field, ‘publish_date’:
   recip(ms(NOW,publish_date),3.16e-11,10,1)

Use the Save Draft button to save your changes. The Publish button makes this Relevance Model available to the Search Preview screen.