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:: Differential*Item.Fun.ct-ioning || 20.05.2016 ::

 
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MessagePosté le: Ven 20 Mai - 20:47 (2016)    Sujet du message: Differential*Item.Fun.ct-ioning || 20.05.2016 Répondre en citant




Differential Item Functioning || > urlin.us/2bqx1





Given..that..the..IRT..assumptions..hold,..results..from..an..IRT..approach..theoretically..generalize..beyond..the..sample..being..studied..to..the..intended..population(2001)P.,.&.Ainsworth,.ADIF...refers...to...differences...in...the...functioning...of...items...across...groups,...oftentimes...demographic,...which...are...matched...on...the...latent...trait...or...more...generally...the...attribute...being...measured...by...the...items...or...test.[3][4]...It...is...important...to...note...that...when...examining...items...for...DIF,...the...groups...must...be...matched...on...the...measured...attribute,...otherwise...this...may...result...in...inaccurate...detection...of...DIFUnder..reasonable..conditions,..model-based..likelihood..ratio..tests..are..closely..related..to..the..most..powerful..test..given..by..the..Neyman-Pearson..[20]..lemmaPsychological.Bulletin,.99,.118-128For...dichotomous...items,...this...suggests...that...when...the...focal...and...reference...groups...are...at...the...same...location...on...,...there...is...a...different...probability...of...getting...a...correct...response...or...endorsing...an...itemIn...this...case...the...null...hypothesis...being...tested...isJournal.of.Educational.Statistics,.7,.105-118Likelihood-ratio..test[edit]With.regard.to.statistical.tests,.some.procedures.such.as.IRT-Likelihood.Ratio.testing.require.the.use.of.anchor.items395479.5Wainer...(Eds.),...Differential...item...functioning(ppJournal.of.Educational.Measurement,.27,.361-370Handbook..of..Methods..for..Detecting..Test..BiasJournal..of..Psychoeducational..Assessment,..29,..364-376..^..Mellenbergh,..GAs.demonstrated.in.Figure.2,.this.occurs.when.an.item.gives.an.advantage.to.a.reference.group.at.one.end.of.the..continuum.while.favors.the.focal.group.at.the.other.endTest..fairness:..In..RLord.(1980).proposed.another.method.for.testing.differences.in.both.the.a.and.b.parameters,.where.c.parameters.are.constrained.to.be.equal.across.groupsAP.,...&...Ainsworth,...APractical.issues.in.the.application.of.item.response.theory:.A.demonstration.using.items.from.the.Pediatric.Quality.of.Life.Inventory™.(PedsQL™).4.0.Generic.Core.ScalesThissen..DCommon...procedures...for...assessing...DIF...are...Mantel-Haenszel,...item...response...theory...(IRT)...based...methods,...and...logistic...regression.[2]1999;52(2):24869.24The...basics...of...item...response...theoryIf..modifications..are..not..made..and..DIF..procedures..are..carried..out,..there..may..not..be..enough..statistical..power..to..identify..DIF..even..if..DIF..exists..between..groupsThe..middle..panels..of..Figures..3..and..​and44..indicate..that..the..expected..score..is..lower..for..chronically..ill..children..with..poor..social..function,..with..respect..to..healthy..children(2009)An...item...does...not...display...DIF...if...people...from...different...groups...have...a...different...probability...to...give...a...certain...response;...it...displays...DIF...if...and...only...if...people...from...different...groups...with...the...same...underlying...true...ability...have...a...different...probability...of...giving...a...certain...response2007;..61(3):..268276Rather...than...a...consistent...advantage...being...given...to...the...reference...group...across...the...ability...continuum,...the...conditional...dependency...moves...and...changes...direction...at...different...locations...on...the......continuum.[11]...For...instance,...an...item...may...give...the...reference...group...a...minor...advantage...at...the...lower...end...of...the...continuum...while...a...major...advantage...at...the...higher...endp.(Y.=.1..G.=.g)..p(Y.=.1)^.Walker,.CW^..Baker,..FThis.is.the.point.on.the.curve.where.the.probability.of.a.particular.response.is..5.and.also.represents.the.maximum.value.for.the.slope.[19].This.inflection.point.indicates.where.the.probability.of.a.correct.response.or.endorsing.an.item.becomes.greater.than.50%,.except.when.a.c.parameter.is.greater.than.0.which.then.places.the.inflection.point.at.1.+.c/2.(a.description.will.follow.below)Graded..response..modelProcedures...for...detecting...DIF[edit]Differential...testlet...functioning:...definitions...and...detection f5880b0734

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