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Rasch Measurement Theory (RMT) person-item location for the remaining 15 Depression Inventory Development (DID) items—The right side of the map displays the items from most difficult (top) to least difficult (bottom), and the left side plots the individual participants, with those at the top having the highest trait level (depression) and those that the bottom the least. M=mean difficulty; S=one standard deviation; T=two standard deviations
