Sheng, XiaomingBiswas, AtanuCarriere, K C2012-11-072012-11-072003-10Biometrical Journal, v.45, no.7, p 837–850,http://hdl.handle.net/10263/4710enRelative efficiencyGeneralized estimating equationsRasch modelLatent variablePolychoric correlationIncorporating inter-item correlations in Item response data analysisArticle