Zachriel
Posts: 2723
Joined: Sep. 2006
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| 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
20
21
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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