Afferent and efferent coupling at package level is already calculated (by the doc jobs on the buildfarm) and shown on the ROS wiki. They are shown in the *Package Links* box to the right of the *Package Summary* section of each package that has a doc job.
See the page for [roscpp](
http://wiki.ros.org/roscpp) for example:
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%20and%20shown%20on%20the%20ROS%20wiki.%20They%20are%20shown%20in%20the%20*Package%20Links*%20box%20to%20the%20right%20of%20the%20*Package%20Summary*%20section%20of%20each%20package%20that%20has%20a%20doc%20job.%0A>%20%0A>%20See%20the%20page%20for%20%5Broscpp%5D(http://wiki.ros.org/roscpp)%20for%20example:%0A>%20%0A>%20!%5Bsshot%7C200x500%5D(upload://6o9hX7GThWuMcPD4EibjJNhZ7An.png)%0A>%20%0A>%20%0A>%20%0A>%20%0A>%20%0A>%20---%0A>%20%5BVisit%20Topic%5D(https://discourse.ros.org/t/what-quality-metrics-do-we-need-to-make-packages-quality-visible/3985/7)%20or%20reply%20to%20this%20email%20to%20respond.%0A>%20%0A>%20%0A>%20If%20you%20do%20not%20want%20to%20receive%20messages%20from%20ros-users%20please%20use%20the%20unsubscribe%20link%20below.%20If%20you%20use%20the%20one%20above,%20you%20will%20stop%20all%20of%20ros-users%20from%20receiving%20updates.%0A>%20______________________________________________________________________________%0A>%20ros-users%20mailing%20list%0A>%20ros-users@lists.ros.org%0A>%20http://lists.ros.org/mailman/listinfo/ros-users%0A>%20Unsubscribe:%20<http://lists.ros.org/mailman//options/ros-users>%0A>%20%0A>%20 "Reply to this message")
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