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. 2014 Jun 19;14:134. doi: 10.1186/1471-2377-14-134

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Copyright © 2014 Persson et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Targeting of persons and items. The figure illustrates the ability of the SwePASS to cover the range of the latent trait, postural control, in the study population. This is done by comparing the distribution of persons (upper plot) and items (lower plot) on the same logit scale, based on the final solution for SwePASS. Towards the right of the scale, postural control increases. Perfect matching happens when both the distributions of persons do not fall outside the distribution of items and when distributions have a mean of zero logits.