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. Author manuscript; available in PMC: 2015 Jun 14.
Published in final edited form as: J Clin Epidemiol. 2014 May;67(5):516–526. doi: 10.1016/j.jclinepi.2013.10.024

Figure 1. Measurement precision and range of two established static tools, PROMIS static forms, a simulated PROMIS PF-CAT with 10 items, and the entire item bank.

Figure 1

The Y-axis shows the standard error of measurement, the X-axis the Θ-value. The graph shows the precision of the test which can be expected at a particular level of Physical Function (latent trait, Θ) based on test information (static forms) or simulation studies (CAT)