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. Author manuscript; available in PMC: 2009 Jan 11.
Published in final edited form as: Drug Alcohol Depend. 2007 Oct 29;93(1-2):163–175. doi: 10.1016/j.drugalcdep.2007.09.010

Figure 2.

Figure 2

Bubble chart of the 16 EBPs administered to the adult sample. The vertical displacement of the bubbles illustrate the “difficulty” of the item; items with negative values indicate a greater likelihood of use. Fit to the Rasch model is illustrated by the horizontal displacement of the items, with better-fitting items obtaining infit values closer to 1 and acceptable infit values occurring between 0.6 and 1.4. The size of the bubbles reflects the precision of the estimates or standard errors.