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It is recommended to use the global filter to slice and dice the data for your reporting needs.
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Bug Density
For most software teams bad quality is the biggest waste and very often a root cause for delays. The problem statement is then how do you know if a team or project have bad quality? A good report for that is bug density. It measures bugs divided with issue output (issue count or story point). So a bug density of 50% means that for 10 issues/story point delivered there is 5 new bug created.
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