DATA Science for Staking

• Lifecycle performance of validators. (How many blocks have they produced, did they ever get kicked out, etc..)

• How does the reward APY change from epoch to epoch, what is affecting it?

• The token flow of big delegation whales. When did they decide to stake and when did they unstake.

• Historical data of the number of delegators (and delegation amount) on each validator node.

It depends , because every hardfork or update new commit, they may reduce the ability to produce blocks or chunks. Sometime it may be more, some time it may be lest each epoch. and it mostly depend on which hardware that they use

So when the is an update and the validator update it, they may be kickout because they dont produce enough blocks or chunks and when they are active again, they are good to go.

APY change every epoch: if your node performed well (high uptime, produce enough blocks/chunks) then your node will receive more rewards, otherwise your node will receive less.

As my monitor with my node: tinanpha.shardnet.near APY currently 3-4%