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Model validation: Difference between revisions
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→The logical trap
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Anyone would agree that the logical inference 'if A is true, then B must be true' combined with the observation that 'B is true' does not imply that 'A is true'. | Anyone would agree that the logical inference 'if A is true, then B must be true' combined with the observation that 'B is true' does not imply that 'A is true'. | ||
And yet this mistake appears to be rather common: if a given plasma model (A) describes a given | And yet this mistake appears to be rather common: if a given plasma model (A) describes a given experimental result (B), it is inferred that the model must be 'OK' - erroneously, because the agreement may be fortuitous or due to constraints that are hard to identify, or the data interpretation problem may be ''badly posed'' (see below). | ||
There are several ways of avoiding this trap: | There are several ways of avoiding this trap: | ||