Antievolution.org :: Antievolution.org Discussion BoardThe Critic's Resource on Antievolution

 Antievolution.org Discussion Board > From the Panda's Thumb > After the Bar Closes... > Evolutionary Computation

 Pages: (14) < [1] 2 3 4 5 6 ... >
 Topic: Evolutionary Computation, Stuff that drives AEs nuts < Next Oldest | Next Newest >
Zachriel

Posts: 2723
Joined: Sep. 2006

Phenotypic Fitness:

noise = sqrt(geno_fitness_variance*(1. - heritability) /heritability + non_scaling_noise**2)

c...  Add noise to the fitness to create a phenotypic fitness score...
do i=1,total_offspring
pheno_fitness(i) = fitness(i) + random_normal()*noise

Leaving aside the non-scaling noise which defaults to zero. And leaving aside the scaling problem which can be overcome with normalization.

c...     For unrestricted probability selection, divide the phenotypic
c...     fitness by a uniformly distributed random number prior to
c...     ranking and truncation.  This procedure allows the probability
c...     of surviving and reproducing in the next generation to be
c...     directly related to phenotypic fitness and also for the correct
c...     number of individuals to be eliminated to maintain a constant
c...     population size.

do i=1,total_offspring
work_fitness(i) = work_fitness(i)/(randomnum(1) + 1.d-15)
end do

The first random factor represents non-heritable influences on phenotype, the second representing chance of successful reproduction. Is there any processing between these two functions that we can't simply reduced to (ignoring the infinitesimal):

pheno_fitness(i) = (fitness(i) + random_normal()*noise)    /  randomnum(1)?

Working fitness being just a copy of phenotypic fitness that is only used for ranking before truncation.

c...  Copy the phenotypic fitnesses into array work_fitness.

--------------

You never step on the same tard twiceâ€”for it's not the same tard and you're not the same person.

 419 replies since Mar. 17 2009,11:00 < Next Oldest | Next Newest >

 Pages: (14) < [1] 2 3 4 5 6 ... >

 Forum Jump -----------   >All About Antievolution   -----------------------    +- Antievolution, Politics, and the Law    +- Intelligent Design    +- Young-Earth Antievolution    +- Old-Earth Antievolution    +- Collaborations   >Specifically About Intelligent Design   -------------------------------------    +- Intelligent Design News    +- Not a Book to Be Tossed Aside Lightly...    +- Cabbages and Kings    +- The ID-files   >Evolutionary Biology   --------------------    +- News & Events   >From the Panda's Thumb   --------------------------    +- After the Bar Closes...   >The TalkOrigins Archive   -----------------------    +- Feedback

 Track this topic Email this topic Print this topic

[ Read the Board Rules ] | [Useful Links] | [Evolving Designs]