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  Topic: Evolutionary Computation, Stuff that drives AEs nuts< Next Oldest | Next Newest >  
Zachriel



Posts: 2723
Joined: Sep. 2006

(Permalink) Posted: June 18 2009,08:00   

Quote (Zachriel @ June 18 2009,07:02)
Quote (Bob O'H @ June 18 2009,01:30)
   
Quote (Zachriel @ June 17 2009,19:39)
 I've been trying to independently implement Mendel's Accountant, but keep running into such definitional problems. Heritability. Fitness. And how they're handling probability selection. I'm working with a simplified model, but Mendel's Accountant should be able to handle the simple cases with obvious results.

My advice: keep away from heritability.  It complicates matters, and is dependent on the genetic variation in the population.  I suspect Sanford et al. don't really understand quantitative genetics: certainly Sanford makes some mistakes because of his lack of understanding in Genetic Entropy.

I've been setting heritability to 1 when running tests, so I should be able to reach comparative results. I think a working heritability parameter could be included in a Mendel's Accountant.  But the concept is sometimes counterintuitive.

We only need to be concerned with ranking, not absolute phenotypic fitness, when simulating heritability. So I've been normalizing fitness (which preserves ranking), then applying the specified noise. For a child population of 25 and heritability of 50%, I get rankings like this. The number is genotypic rank, the position is phenotypic rank.

3
5
1
8
6
2
9
7
12
15
4
13
11
10
22
19
16
14
18
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24
23
17
25

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You never step on the same tard twice—for it's not the same tard and you're not the same person.

   
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