Honestly I am thinking that weighted average is the explanation here.
Simple average wont represent the data well, cause you can have many blocks stacked in short period with low diff.
How do you calculate weighted average? What blocks are more important than others?)Simple average wont represent the data well, cause you can have many blocks stacked in short period with low diff.
If there are many blocks with low diff then next there will be blocks with much higher diff.
Difficulty basically defines the expected number of hashes to mine a block, if nethash finds block faster or slower than target spacing then diff is adjusted accordingly.
If diff retargeting is working correctly, simple average of all diffs will give very accurate number of hashes on a long interval. And 24 hours is pretty long, hundreds or even thousands of blocks.
In other words taking all blocks from last 24h and calculating simple avg is not good or wanted.
It matters how long each difficulty period was mined for.
You are polling diff each N minutes, what is your avg called? Absolutely random? It matters how long each difficulty period was mined for.
