Er adjustment for DIF by means of item split (y-axis) compared to those obtained from the original items not adjusted for DIF but anchored by DIF-free item calibrations from the DIF-adjusted scale (x-axis).<p><b>Copyright information:</b></p><p>Taken from "Cross-diagnostic validity of the Nottingham health profile index of distress (NHPD)"</p><p>http://www.hqlo.com/content/6/1/47</p><p>Health and Quality of Life Outcomes 2008;6():47-47.</p><p>Published online 2 Jul 2008</p><p>PMCID:PMC2483964.</p><p></p
