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Fig. 1 | Alzheimer's Research & Therapy

Fig. 1

From: Assessing individual-level change in dementia research: a review of methodologies

Fig. 1

Example item characteristic curves (ICCs) for three hypothetical items. The x-axis shows the latent attribute (θ) scale. θ = 0 represents average cognitive ability. Negative numbers are below average θ levels and positive numbers are above average θ levels. Position on x-axis is determined by the location parameter and represents item difficulty. The steepness of the slopes of the lines are determined by the discrimination parameters. Items with steeper curves better discriminate between individuals with adjacent θ values when compared to flatter curves

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