But he gave it a fairly precise meaning with a lot of explanatory power.

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Gratified, because the idea of inclusive fitness has enormous explanatory power, even for human behaviour.

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To put things in perspective, an R2 of 0 would indicate no fit at all, that the model had no explanatory power.

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Even more strangely, in a very compelling section on learning, Brooks has high-school Harry develop a fascination with the impressive explanatory power of thumos, the ancient Greek notion of, among other things, status motivation.

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At the risk of giving unintended offense, acknowledging that generalizations are limited in their explanatory power, and assuming that the reader is fair-minded enough to appreciate that explanation does not imply justification, let me attempt an answer.

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