Mining pool hashrate chart

[A-XBT]

http://a-xbt.com/#/stat/

This chart shows the performance of the pool using a moving average  on the number of blocks found. We do not rely on the data of the owners of the pool and calculate the performance of a pool solely on data from blockchain.

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[kano]

The BTC blockchain is only a store of blocks, it contains no actual statistics of any mining.

What I mean by this is that you need hundreds if not thousands of blocks in the BTC blockchain to estimate a pools hash rate based on blocks found (and that also ignores stale blocks and orphans)
Block finding is (mostly) random luck, so to reduce the (mostly) random luck in a calculation based on those (mostly) random luck events, you need a lot of data.
The reason the difficulty changes every 2016 blocks is because it takes a lot of blocks to estimate the network hash power with any accuracy - but even with 2016 blocks it's not very accurate.

... most pools hash rate varies per block found, so using a set of (mostly) very random data to estimate a moving target is not gonna be very accurate for most pools other than the top few around 10% or more of the network.

[A-XBT]

yes, you said true.
But usage the moving average 7d, 3d,  1d, we get  fairly accurate range of hashpower pool for the selected period. This chart interactive, and you can zoom some periods.