Query taxonomy
Compare searches that try to solve the same kind of problem.
A total average hides differences between SKU-search, brand questions, category questions and natural language.
SKU and identifiers
Exactness and standardization are central.
Brand and product name
Protect well-known entities from too broad interpretation.
Category and attribute
Measure whether filters and product data support the intention.
Long-tail
Use context and semantic matching without ignoring hard constraints.
Problem queries
Save zero-result searches, bad CTR and many reformulations as separate groups.