What are the types of "sources of risk" that customers may not solve, and what are the statistical bases for their data?

Explanation of sources of risk (sum over selected time periods) :

- More no feedback help: click no feedback help and submit, the keyword is the title of this article;

- More secondary search: Within the selected time, the same user searches for the same keyword more than twice, that is, a secondary search;

- Repeated view of more documents: the same user, the document is loaded more than twice, the keyword is the title of the document;

- More manual customer service: click on the page of manual customer service, and the keyword is the title of the document;

- No results for more searches: No results for keyword searches, keywords are search terms;