nshepperd comments on Anticipating critical transitions - Less Wrong

17 Post author: PhilGoetz 09 June 2013 04:28PM

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Comment author: nshepperd 10 June 2013 04:42:41PM *  0 points [-]

Here is the exact solution for the expected value of G/(G+B) with k families. From numerical calculation with k up to 150, it looks like the discrepancy 0.5 - g/(g+b) approaches 0.25/k (from below) as k goes to infinity, which is certainly mysterious.

(The expected value of G-B is always 0, though, so I don't know what you mean by an excess of 0.3.)

Comment author: Luke_A_Somers 10 June 2013 05:45:08PM *  0 points [-]

So for a reasonably-sized country of 1 million people, we're looking at a ratio of B/(B+G) = 0.50000025? I'll buy that.

And the 0.3 was a screwup on my part (my mistaken reasoning is described in a cousin of this post).

Funny though that the correct answer happens to be really close to my completely erroneous answer. It has the same scaling, the same direction, and similar magnitude (0.25/k instead of 0.3/k).