Just had a second look. Now we do count a skipped program as a fail which 
hasn't be the case in the previous version. 
>From what I can see in the old version the algorithm was:

if failed --> scale the old stats to 80% (resulting in asymptotically falling 
values if fail everytime)  

if skipped --> scale old percentage to 98% (which is basically stable for a lot 
of time)

if success --> scale to 80 % of previous and add 20 % (resulting in 
asymptotically rising values)

the UI percent is not really a percentage of successful time but a percentage 
of successful attempts. Which mean it does not reflect different length of 
programs. The UI also provides a trending. So for me it might be worth a try to 
use the UI percentage, cause it only updates if needed (failed or complete) and 
we removed the effect of skipping on stats with one of the balancing branches 
thanks to stonerl inventing the state no stats. So for me the UI stats are 
pretty reliable now in terms of successful attempts. 
-- 
https://code.launchpad.net/~widelands-dev/widelands/ai_productionsites_statistics/+merge/367613
Your team Widelands Developers is requested to review the proposed merge of 
lp:~widelands-dev/widelands/ai_productionsites_statistics into lp:widelands.

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