Figure 2From: Dimensionality and scale properties of the Edinburgh Depression Scale (EDS) in patients with type 2 diabetes mellitus: the DiaDDzoB study Item-fit plots for ( a ) Item 3 (female sample), ( b ) Item 4 (female sample) and ( c ) Item 9 (male Sample). Figure note: Solid line = Observed item-score function; Dashed line = Expected item-score function under the Graded Response Model; Dashed/dotted lines indicate 95%variability envelopes under the Graded Response Model.Back to article page