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Item–person map for a Rasch analysis including both ProMAS (gray) and MARS (black) items.
Notes: Both the person abilities (thetas; above the axis) and item difficulties (deltas; below the axis) are mapped on the x-axis in logits. The y-axis represents the numbers of people or items with that ability or item difficulty.
Abbreviations: MARS, Medication Adherence Report Scale; ProMAS, Probabilistic Medication Adherence Scale.
