I did more research and found this paper:
http://som.utdallas.edu/capri/contribution_pattern.pdf
Which had these metrics:
Apache httpd GCC GDB Mplayer GAIM
Total number of patches 2350 19487 7266 2652 1848
Percent of patch postings
by core group 73.95% 80.12% 71.08% 24.66% 12.44%
Percent of patches submitted
or reviewed by core 88.72 90.85 91.91 75.76 71.81
Percent of patch submitted
by core with no reply 32.85 43.81 45.18 26.91 53.91
Percent of patch submitted
by non-core with no reply 43.3 46.06 27.98 32.18 32.22
Average number of respondenents
per patch 1.81 1.26 1.31 1.77 0.94
Average number of core group
respond per patch 1.62 1.09 1.04 1.01 0.74
Average number of replies
per patch 2.92 2.14 2.45 3.2 NA
Average numberof replies
by core per patch 2.62 1.90 1.92 1.8 NA
My impression is that patchwork at least solves the no reply issue.
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