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. 2015 Mar 13;10(3):e0118589. doi: 10.1371/journal.pone.0118589

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© 2015 Kern et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 3 — Threshold distributions used for simulations, based on model-estimated distributions for the 590 normosmic sample and the NSHAP Wave 2 sample (n = 2,207) of older adults. The means and standard deviations for both samples are as estimated by the IRT model; the Normal distribution for the NSHAP sample has been replaced by a gamma distribution with identical mean and standard deviation, to more closely approximate the likely distribution of thresholds in the population.