| Optimum Interpretation |
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| q | The optimum interpretation (OI) is a linear interpretation which |
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| requires its root-mean square error to be minimum. |
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| q | The discussion of this method focuses on the “deviations from a |
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| normal state”: |
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| q | Let’s say we have a variable f
and its normal state f norm. This |
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| normal state can be the climatological value of f or a first guess |
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| of f. |
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| q | Then we can define the deviation of f
from its normal state as f’: |
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