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Based on the quality of some of the new question we see every day, some users think we collect trash here on Arduino SE. But we don't collect it all really. Stack Exchange system has a cleaning process nicknamed Roomba (as the robotic vacuum cleaner). Roomba deletes closed question without answer 10 days after asked. Roomba deletes unanswered questions with negative score 30 days after asked.

Today I made for me an overview of questions count based on close state, answered and score. There were 23764 questions total at that time. I used advanced search with queries like closed:yes answers:0 duplicate:no score:1..1.

Questions (not closed) with at least one answer:

score count % of all questions
score 2 or more 4570 19%
score 1 5253 22%
score 0 7432 31%
negative score 1189 5%

Questions (not closed) without answers:

score count comment
score 1 or more 2877 13% of all questions
score 0 462 one dovnwote will make them ready for deletion
negative score 26 roomba will delete them soon if no upvote happens

Closed questions (not duplicates) without answer:

score count comment
score 2 or more 42
score 1 151 one dovnwote will make them ready for deletion
score 0 or less 57 roomba will delete them soon if no upvote happens

We have 437 questions marked as duplicate. Roomba only deletes "closed as duplicate" questions with negative score and no answer. There are 121 duplicate questions for which one dovnwote will make them ready for deletion.

We have 1177 closed (not as duplicate) questions with an answer. It is 5% of all questions.

Voting on questions is important. Their score decides the deletion. Many times one vote makes a difference.

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