I was wondering how Guild Level and Guild Strength Rankings are calculated?

I am a Guild Master and trying to make my Guild stronger and raise in rank but it seems other guilds do a better job than me lol.
So maybe If I knew exactly how those 2 rankings are calculated it would help me.
Especially Guild Strength Ranking is very important since they say that soon only 8 first guilds in each server will part in Guild Battle.
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