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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Questions, concerns, or suggestions about a tag or about the way tags are used on our site.
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when examining what is on-topic or off-topic, and why, and how to deal with off-topic questions.
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For questions regarding the nature of a "question" on Cross Validated; e.g. how to ask, whether specific questions are appropriate, etc.
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for general questions about questions that have been closed because they are off-topic or otherwise do not meet the criteria defined in the FAQ.
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Questions about answers: how to answer, whether specific answers are appropriate, and so forth.
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Questions about tag synonyms (how they work, who can create them, synonym suggestions etc).
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small addendum to each question or answer, intentionally limited in size and formatting.
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For questions about the process of editing, how edits work, and other general inquiries about the edit system, used in editing questions, answers, tag wikis...
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Questions related to policies and guidelines of the Stack Exchange sites.
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the primary way users gain reputation, and also which items are sorted at the top.
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Questions dealing with moderator actions, pages, abilities or decisions.
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the process of moving threads from one Stack Exchange site to another.
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The process of identifying and closing questions that are exact duplicates of another question
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a measurement of a user's contributions to the site, and the extent to which the community "trusts" that user with extra privileges.
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Mechanisms for displaying mathematical notation.
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For R related topics such as: scope, migration, markdown and guidance about how to ask/answer on the main site
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"Design" refers to front-end elements, such as page layout, coloring conventions, etc.
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Questions with no answers, or with answers that have zero score or less and none of these is accepted
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held to choose moderators for non-Beta Stack Exchange sites
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The users' engagement within the Cross Validated Stack Exchange site
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For issues with ambiguous/suboptimal tags that require manual reorganization (i.e. cannot be resolved by creating a tag synonym or deleting a tag).
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The scope of statistics software-related questions on Cross Validated
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For questions about the /review path where users can view and act on posts by other users that the system thinks may need attention.
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For proposing and discussing new tags.
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the most visible portion of tag wikis. They're shown when hovering over a tag, on the Tags page, and in the autocomplete suggestions when adding tags.
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A request to reopen a closed question, or receive further explanation of why it was closed.
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a way to get additional attention for a question by offering some of your own reputation for great answers.
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the norms and standards of accepted behavior and politeness in our community
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Users who may be new to the Cross Validated SE Q&A format, and generally have a low reputation score, which starts from 1 at the time of registration.
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For questions about the process and etiquette of deleting existing tags.