Tracked searches are searches where clickAnalytics is set to true, including searches with no results.
- Click-through rate (CTR) is the percentage of tracked searches that result in at least one click on a result.
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No-click rate is calculated from tracked searches that return at least one result. It represents the percentage of these tracked searches that never generate any clicks.
Therefore a no-click rate of 100% can be a result of:
- If you don't have tracked searches (ie. clickAnalytics:false) and therefore you won't have clicks to go with them.
- If you do have tracked searches but none of them generate clicks.
If you have tracked searches that you believe are generating clicks but your no-clicks rate is unexpectedly high, you should troubleshoot your implementation to ensure that the clicks are correctly associated with their corresponding searches.
You can find more on the relationship between CTR and no-click rate here.