Morendil comments on Open thread, October 2011 - Less Wrong

5 Post author: MarkusRamikin 02 October 2011 09:05AM

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Comment author: selylindi 14 October 2011 05:05:35AM 8 points [-]

On the Freakonomics blog, Steven Pinker had this to say:

There are many statistical predictors of violence that we choose not to use in our decision-making for moral and political reasons, because the ideal of fairness trumps the ideal of cost-effectiveness. A rational decision-maker using Bayes’ theorem would say, for example, that one should convict a black defendant with less evidence than one needs with a white defendant, because these days the base rates for violence among blacks is higher. Thankfully, this rational policy would be seen as a moral abomination.

I've seen a common theme on LW that is more or less "if the consequences are awful, the reasoning probably wasn't rational". Where do you think Pinker's analysis went wrong, if it did go wrong?

One possibility is that the utility function to be optimized in Pinker's example amounts to "convict the guilty and acquit the innocent", whereas we probably want to give weight to another consideration as well, such as "promote the kind of society I'd wish to live in".

Comment author: Morendil 17 October 2011 04:10:18PM 3 points [-]

One (more) reason to be uncomfortable with such an argument: "black" doesn't carve nature at its joints.

(Whereas, relevantly for such arguments, "poor" does - though I believe that arguing that way leads down the path that has been called "reference class tennis".)

Comment author: Jack 17 October 2011 06:03:56PM 3 points [-]

For questions of, say, population genetics, I think that is quite right. But for questions of sociology or social policy I don't see why one wouldn't include 'black' as part of the ontology.

Comment author: Emile 17 October 2011 07:20:17PM *  3 points [-]

Doesn't it?

When it comes to US demographics, "black" covers a "natural" cluster of the population / identifiable blob in thingspace. Sure, there are border cases like mixed-race people and recent African immigrants, just like there are edge-cases between bleggs and rubes. "Is person X black or not?" is probably one of the top yes/no questions that would tell you the most about an American (Along with "Did he vote for Obama?", "Is he richer or poorer than the median?", or "Does he live north or south of the Mason-Dixon line?")

Sure, when it comes to world demographics, or Brazilian demographics, it doesn't cut reality at it joints as well.

Comment author: Vaniver 17 October 2011 10:18:01PM 2 points [-]

Mason-Dixie

It's Mason-Dixon, after the two surveyors.

Comment author: Emile 18 October 2011 07:41:43AM 1 point [-]

Whoops, thanks!

Comment author: lessdazed 17 October 2011 11:22:40PM 0 points [-]

That's not too important. If I go to my closet and pull out twenty items of clothing at random, and designate those group A, and designate the rest group B, if I know what is in each group I can still make predictions about traits of random members of either group.