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MSP5forWindowsincorporatesmanynewfeaturesandimprovements.Forexample,manyenhancementstotheuserinterface,fastercalculations,andadditionofnewoutputmodules.
MSP,MokkenScalingforPolytomousitems,offersscalingfacilitiesforthecumulativenonparametricitemresponsetheorydevelopedsince1971byMokkenandotherDutchresearchers.Measurementoflatentattributesoccursinallsocialandbehavioralsciences.Suchscalesareoftenusedtomeasurepropertieslikeacademicachievement,personalitytraitslikeextraversion,orpersonalattitudesaboutpolitical,moralorsocialissues,orapatient’sviewsonqualityoflife.Fromtheresponsesofpersonstoanumberofitemsorquestionsindicativeofthelatenttrait,scalescoresforthepersonsareobtainedandthequalityofthemeasurementinstrumentisevaluated.MSPisasimpleandflexibletoolforthistask,widelyapplicablebecauseitisbasedonmildstatisticalassumptions.Itcanbeused,forbothdichotomousandpolytomousdata,for:
-stepwiseconstructionofoneormoreunidimensionalscalesfromapoolofitems;
-evaluationofthemodelfitofagivenscale,includingtheassessmentofitsreliabilityandsuggestionstoremovecertainitemsthatspoilthefitdetectionoftheextenttowhichtheanswerpatternsfollowthecumulativeGuttmanscalogrampattern,foranitemorderfoundfromtheoryorfromthedata,byLoevinger’sH-values,withstatisticalsignificancetestsadded.
MSPMainMenu
MSPanalysesaredividedintofivesteps:DefineData,SelectandRecode,InitialCalculations,ScaleAnalysisandViewResults.
Step1:DefineData
Afterthedesireddatafilehasbeenopened,ascreenappears,whichplaystheroleofaDefineDatadialoguebox.
Step2:SelectandRecode
Thisbuttonallowsonetoselectandpre-processthedatabeforetheanalyses.Aselectionofcasescanbemadebyspecifyingacriterion,suchasAgebelwo65.Also,theusermayselectasubsetoftheavailableitems.
Step3:InitialCalculations
Precedingtheactualscalingprocedure,theitemsteporder,thebivariatetablesandanumberofbasicmatricesarecalculated.TheStep3windowallowschangingthedefaultspecificationsforthesecalculations.
Step4:ScaleAnalysis
Thisstepisprobablythemostimportantone.Itenablestheusertospecifythedetailsforeachscaleanalysis.Onecanenterupto10analysisspecificationstobeexecutedoneaftertheother.
Step5:ViewResults
Theuserseesthenamesofthemanypartsintowhichtheoutputisdivided.Figure3presentsanexample.Therearenowseveraloptionstoview,(seeexampleinfig.4),printorsaveeitherpartsoftheoutputorthecompletereport(whichisusuallyquitevoluminous).Specialbuttonsallowreturningtostep2orstep4,inordertorestarttheanalysisfromthesameinitialsettingwithasmallmodification.
Version5ofMSPhasauser-friendlyandflexibleWindowsinterface,withcomputations,anenlargementofthedatasetlimits,andimprovementsinselectingcasesanditems.EstimatedItemStepResponseFunctionsofitem11,withnegligibleviolationsofmonotonicity
KeyFeautures
-Summariesofthemainresults;
-Extendedwaystoanalyzeandcompareseveralsubgroupsinonerun
-Extendedchecksoftheassumptionsunderlyingthemodelsformonotonehomogeneityanddoublemonotonicity;
-Thepossibilitytosaveorprinteitherthefulloutputoruserselectedpartsoftheoutput’
-Severaloptionstoreturntoearlierinputstepsmaintainingorchanginginformation.
-ThescalingproceduresoftheprogramcanhandleASCIIfileswithupto300polytomousitemswithamaximumof10orderedcategorieswithinagivenrange(900itemsteps).Subjectswithvaluesoutsidethisrangearedeleted.Thenumberofsubjectsisrestrictedto100,000.
Relevantliterature
-R.J.Mokken,NonparametricModelsfordichotomousresponses.In:W.J.vanderLinden,R.K.Hambleton,(eds.),handbookofModernItemResponseTheory,351-368,NewYork:Springer.-Molenaar,I.W.,(1997),Nonparametricmodelsforpolytomousresponses.In.W.J.vanderLinden,R.K.Hambleton,(eds.),HandbookofModernItemResponseTheory,369-380.NewYork:Springer.-Sijtsma,K.(1998).MethodologyReview:NonparametricIRTapproachestotheanalysisofdichotomousitemscores.AppliedPsychologicalMeasurement,22,3-31.
MSP5comeswitharevisedanddetailedusermanual,whichincludesanextensivegeneralandtheoreticalintroduction.Anon-linehelpmakesiteasytofindinformation.
