@davidmanheim @rlmcelreath The *for doing X* is essentially always implied as *for being true isomorphism of real world process*
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Replying to @LifeOfMyMoon
@davidmanheim@rlmcelreath Models useful because they have no purpose other than truth-tracking. They make no recommendations as to actions.1 reply 1 retweet 1 like -
Replying to @LifeOfMyMoon
@LifeOfMyMoon@rlmcelreath I do of work with models that include utilities; I can infer utilities from data, though, so it can be normative.1 reply 0 retweets 0 likes -
Replying to @davidmanheim
@LifeOfMyMoon@rlmcelreath (But now this question is about how we limit the scope of what we call a model.)1 reply 0 retweets 0 likes -
Replying to @davidmanheim
@davidmanheim@rlmcelreath I'd argue models, as the name implies, should be restricted to concept of representationpic.twitter.com/apz64izPAk
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Replying to @LifeOfMyMoon
@LifeOfMyMoon@rlmcelreath ES Quade (1972); So represent for purpose of choice; good model depends on which choice.pic.twitter.com/ANndxKM63r
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Replying to @davidmanheim
@davidmanheim@rlmcelreath Complicated way of stating that a function from choice to outcome should be modeled well. Still descriptive.1 reply 0 retweets 0 likes -
Replying to @LifeOfMyMoon
@davidmanheim@rlmcelreath Interested in a choice? Make it a variable x. Find f(inputs, x) -> output. f is your model, x can be optimized.1 reply 1 retweet 0 likes -
Replying to @LifeOfMyMoon
@LifeOfMyMoon@rlmcelreath That's unreasonable; you never have perfect models, you make tradeoffs between accuracy about different things.1 reply 0 retweets 0 likes -
Replying to @davidmanheim
@LifeOfMyMoon@rlmcelreath If you need f(inputs, x, y, z) to optimize x, or y, your best model is different. (Like the optimizer's curse).2 replies 1 retweet 0 likes
@davidmanheim @rlmcelreath Yes, now the system is larger. Your model is higher fidelity in one part than another. Still a representation.
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Replying to @LifeOfMyMoon
@davidmanheim@rlmcelreath A Taylor series is a model of a function; you've *chosen* a point to approximate locally, but still has veracity.1 reply 0 retweets 1 like -
Replying to @LifeOfMyMoon
@LifeOfMyMoon@rlmcelreath Right; those are explicitly different models; which model you use depends on purpose - neither is "false".1 reply 0 retweets 0 likes - 11 more replies
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