I've been looking at a graph in Nature, where values are "expressed as percentage departures from norm values for 1950-2000."
My question is whether you read anything into a "norm" that is different from an "average".
The dictionary to hand (Collins) gives two usages, but my own reading is that a norm has implications of being a standard, an "expectation" in the sense of desire or requirement rather than just a measure of location.
Comments to me please, and I'll summarize
Allan
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