See this portion of this article rephrased:
- Tracked searches are searches where
clickAnalyticsis set to
true, including searches with no results.
- The CTR is the percentage of tracked searches that generated at least one click on a result.
- Algolia computes the no-click rate based on the total number of tracked searches with at least one result.
- The no-click-rate is the percentage of tracked searches yielding results that have a query that never generates any clicks.
So, if you don't have tracked searches, you won't have clicks to go with them. If you don't have clicks on tracked searches, you'll also have a no-clicks rate of 100%.
If you have clicks, and you have tracked searches, you should troubleshoot you implementation to ensure that the clicks correspond to those searches you are seeing.