Historical Clickthrough Rate hCTR() Function

A Historical Clickthrough Rate hCTR() Function is a clickthrough rate function that is a historical aggregate function.

• Context:
  • It can be expressed as [math]\displaystyle{ h_{CTR}(\text{itemInfo}, \text{contextInfo}, \text{userInfo}, \text{tStart}, \text{tEnd}) }[/math]
  • It can range from being an Item-Specific hCTR to being an Item Segment-Specific hCTR (such as an: all-items hCTR).
  • It can range from being a Person-specific hCTR() being a Person Set-level hCTR (such as a: population-level hCTR()).
  • It can range from being a Contextual hCTR() to being an All-Contexts hCTR().
  • It can be produced by a Clickthrough Rate Querying System (that solves a clickthrough rate querying task).
• Example(s):
  • VigLink's hCTR.
  • …
• Counter-Example(s):
  • a Predicted Clickthrough Rate eCTR() Function.
  • hEPC.
  • Historical Item Relevance.
• See: Historical Earnings-per-Click Function.

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