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Update algorithm to match the latest Glicko-2 documentation

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On 2022-03-22, the Glicko-2 algorithm was updated, with the following
line being added to the [Glicko web page][1]:

> This document has been revised on March 22, 2022, to replace a "<"
> with "<=" in item 4(b) of Step 5 (page 3).

See the [Glicko-2 document][2] for details.

Tests for this change are missing, as at the time of writing I couldn't
figure out a test that only made use of the current public interface.

  [1]: http://glicko.net/glicko.html
  [2]: http://glicko.net/glicko/glicko2.pdf
This commit is contained in:
Mikael Muszynski 2024-06-08 17:18:25 +02:00
parent 172f8dd8d0
commit 9cb997e2c1
1 changed files with 1 additions and 1 deletions
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lib/glicko.ex
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@ -268,7 +268,7 @@ defmodule Glicko do
fc = calc_f(alpha, delta, player_pre_rd_sq, variance_est, sys_const, c) fc = calc_f(alpha, delta, player_pre_rd_sq, variance_est, sys_const, c)
{a, fa} = {a, fa} =
if fc * fb < 0 do if fc * fb <= 0 do
{b, fb} {b, fb}
else else
{a, fa / 2} {a, fa / 2}