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. 2009 Feb 25;276(1663):1797–1804. doi: 10.1098/rspb.2008.1635

Figure 3.

Figure 3

Cross-validation. Result for estimating the value of the smoothing parameter λ for observer a in figure 4, with σ=2. The minimum with respect to the negative log likelihood corresponds to λ≈400. This curve is typical of that obtained for other observers, and a value of λˆ=400 was therefore used for all human observers.