Missions & Complexes

I'm quite sure this is a really stupid question, but if I can't ask a stupid question on an Internet forum, where can I?

I was thinking of how we (collectively) train battleship spawns in belts (if this is even still a thing), and began to wonder if there are other things in EVE affected by similar means. More to the point, is there any way to train an individual system/constellation/region, to spawn particular anoms and signatures?

I would assume each system/area of space has a particular spawn table, from which it pulls as to what's spanwed. So, similar to NPC belt spawns, is there any way we as capsuleers can impact in our favor, what spawns? Is there any correlation to system activity (NPCs killed, sites completed, etc) that directly impacts what we encounter in an NPC PvE environment? I know that one can impact to some degree, in nullsec, the quality of such spawns. What I'm asking, is whether or not one can impact it further, and in other space (low-sec, high-sec, wormhole).

With all the game's massive amount of metadata, is there a table somewhere that is in some viewable form, that tells us what we can expect to see spawn, and at what percentage?

only really SOV upgrades can make pve better, generally the lower sec status you go the quality and payout is more, but so is the diffeculty and the risk

well upgraded sov systems spawn specific anoms, upgraded systems will always have 1 sanctum and a certain amount of havens

These have been great responses, thank you!

Regarding an anomaly respawn, do we (collectively) know how they respawn? So, for instance, let's take....Genesis as an example. Does Genesis have a spawn table (for lack of a better word) that says Genesis will always have X amount of anoms, and that X amount is made up of Y amounts of the various anomalies? So does it govern these anomalies through the entire region itself, or does it break it down further into constellations, or specific systems?

If we knew what constellations/areas had, in terms of what they can spawn, then in some fashion, perhaps it would be possible to train, by way of random algorithms behind the scenes, sites to spawn.

A secondary question, that is also as stupid as the primary. Do sites despawn once entered (whether the trigger for that site has been completed or not), and what is the timer for such despawns, and subsequent respawns? Or is this not fully known?

It very much does indeed, thank you. I'll keep poking about in space and see if I notice any patterns.