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Ah, I think that's right. Trust can't get negative because of a post-processing step in which the final trust scores are normalized between 0 and 1. I think the raw, unnormalized trust scores could get negative though.
I don't know about trust scores only ever increasing though. I don't think I see that from the code.
If you're interested in some of these details, here's a link to the github discussion that I started about this.
Cool, I'll check it out.
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Interesting discussion. Most of those points seem pretty easy to fix. I like the idea of grounding it all in a behavioral model.
The point about long histories is interesting to me. I think your suggestion about only including items that both stackers are probably aware of would help a lot. Otherwise, my trust with new users (and theirs with me) will be weird.
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