Zachriel
Posts: 2723
Joined: Sep. 2006
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There was some question about the mutation algorithm. It's based on a mirror of this RndGamma distribution. {The lip at 1.000000 is due to cutting off the maximum effect at an arbitrary level.}
The probability distribution of mutational effect tends to be very small, with larger effects increasingly rare.
The routine usually returns a multiplier of just a little more than one (favorable), or a multiplier of just a little less than one (deleterious).
Deleterious and favorable mutational effects have an identical distribution, except that favorable mutations are generally much rarer. I'm using the Excel Application GammaDist function. It's not a perfect distribution, but should be more than sufficient for our purposes.
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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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