To get some knowhow - its important to perform tests! Not all have the possibilities to do the tests by themself, so we would like to share the results from the tests we perform here at hashrate.no :D
All miner tests are based on a runtime of minimum 1 million shares using TRM Ethash Miner Tester v1.0.0! If deviation are negative, the miner are over-reporting - If the deviation are positive, the miner are under-reporting the hashrate. The miner fee are accounted for. Estimates are with 99% certainty. If you want to learn more about hashrate, read our article!