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This is really @Amadeus's answer (so I'll delete this if s/he posts under his/her own account), but I didn't want it to be lost in a comment: I'd call it a "proxy", often computed or logically ...
Answer
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/43449 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43449 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
This is really @Amadeus's answer (so I'll delete this if s/he posts under his/her own account), but I didn't want it to be lost in a comment: > I'd call it a "proxy", often computed or logically inferred. 2nd Definition at Link below, reads "A figure that can be used to represent the value of something in a calculation. ‘the use of a US wealth measure as a proxy for the true worldwide measure’" en.oxforddictionaries.com/definition/proxy – **Amadeus** Mar 3 at 22:54