"Precision versus accuracy" -- Do I hear a little Talavera in the background?
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Actually no Talavera in this. Accuracy, bias, and precision. The three elements of qualty control for data - in my case envionmental chemistry.
Accuracy being the deviation from the true measurement
Precision the reproducibility of a measurement
Bias a shift in results in a consistent direction
Like a bullseye, accuracy is the center, precision is hitting the same spot everytime (which may not be the center), bias consistently shooting (e.g.) left of center.
Computers are great at precision, but not necessarily accurate or unbiased. Some of the older algorithms are known to be biased (e.g. haldane and buhlmann ignore bubbles). Newer algorithms may have biases but they are so complicated and/or propreitary that its increasingly difficult to know their directions.
Accuracy is unknowable in this case (most cases actually), since DCS isn't even a yes-no phenomenon. Confusing the precision of computers with accuracy is very common. But the computer will only be accurate if the underlying model (the target, thats you) happens to align on that day with where its consistent results end up.
Accuracy being the deviation from the true measurement
Precision the reproducibility of a measurement
Bias a shift in results in a consistent direction
Like a bullseye, accuracy is the center, precision is hitting the same spot everytime (which may not be the center), bias consistently shooting (e.g.) left of center.
Computers are great at precision, but not necessarily accurate or unbiased. Some of the older algorithms are known to be biased (e.g. haldane and buhlmann ignore bubbles). Newer algorithms may have biases but they are so complicated and/or propreitary that its increasingly difficult to know their directions.
Accuracy is unknowable in this case (most cases actually), since DCS isn't even a yes-no phenomenon. Confusing the precision of computers with accuracy is very common. But the computer will only be accurate if the underlying model (the target, thats you) happens to align on that day with where its consistent results end up.
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