Rules Compliance Index
The Rules Compliance Index (RCI) is an advanced metric calculated by Sonar.
During data collection, Sonar collects data from 3 rule engines : checkstyle, PMD and FindBugs. Sonar then aggregates, based on the configuration of each of the rule, the number of times rules have been violated in the project.
That is how Sonar compiles the RCI = 100 - ( weighted_violations / nloc * 100 )
More detail on metrics is available here.
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