Item Statistical Codes

What is an Item Statistical Code?

Item statistical codes are item descriptions used to enhance reports. Use of item statistical codes will be required for all libraries. Stat codes will work in conjunction with material types and collection to provide more specific reporting options for library staff.


Where did the Item Statistical Codes come from?

Item Stat Codes were mapped from combinations of Item Category 4 and Item Category 1, to values developed by the Database Management Committee and shared during profiling.



Item Cat 1


Item Cat 4


Item Stat Code

General Mapping

When item cats 1 and 4 tracked different information, item cat 1 was used to map to stat class unless that same data was also tracked in call number or shelf location.


Where similar information was replicated in call number or shelf location, the more specific information was used (fiction versus mystery, for example).


Where item cats 1 and 4 were in conflict (for example, item cat 4 listed a dewey number and item cat 1 listed fiction) or no data corresponding to an item stat class was available (no cat 4 value, and a cat 1 value like audiobook), the call number was referenced. If a Dewey number could be identified, the appropriate decade was assigned. If no Dewey was recognized, Fiction was used as a default.


Nonfiction material was mapped to the appropriate Dewey decade when possible, with the exception of a few key categories. Collections that were often pulled out from a general nonfiction collection and/or span multiple Dewey ranges were given general categories, including: business, test preparation, language learning, and biography.


Where a Dewey number could not be determined based on existing item categories, the Polaris data team attempted to parse the call number. If not possible, the stat class was mapped to Nonfiction.

Children’s Material

Several reading- or audience- level values were submitted for Item Stat Class that, in many cases, could not be mapped given the existing data. For example, chapter books or junior materials. Other values were assigned instead as appropriate, including Fiction, Nonfiction, or other content-related values.

Local Use

Several item stat classes contained data specific to individual libraries, like Locked Case, Outreach, or acquisition data. If the data was not replicated elsewhere, like shelf location or call number, an item note was added and/or affected records were put into a record set for easy identification during testing.