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avichapman comments on Evolutions Are Stupid (But Work Anyway) - Less Wrong

34 Post author: Eliezer_Yudkowsky 03 November 2007 03:45PM

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Comment author: avichapman 16 May 2012 04:31:44AM 2 points [-]

Generations to fixation = 2 ln(N) / s Probability of fixation = 2s

Are there domains limits for 's' on those equations?

It seems to me that if you have an s that is negative, you get a nonsensical answer for both equations. Though I suppose that equation one's answer can be interpreted to mean that it would take -[Generations to fixation] generations for a bad, but ubiquitous mutation to get winnowed down to one individual.

But with the second equation, a negative s leads to a less than zero chance of fixation and an s higher than 50% leads to a greater than 100% chance of fixation.