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Measurement and Data CollectionMeasurement and Data Collection
What and How?What and How? Types of ScalesTypes of Scales
NominalNominalOrdinalOrdinalIntervalIntervalRatioRatio
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2ReliabilityReliability
““Does the instrument provide us Does the instrument provide us
with with consistentconsistent assessments?” assessments?”
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3ReliabilityReliability
• TheoryTheory
•XXTotalTotal = X = XTrueTrue + X + XErrorError
•VVTotalTotal = V = VTrueTrue + V + VErrorError
• Reliability = Reliability = VVTrueTrue
VVTotalTotal
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4 •ReliabilityReliability
TheoryTheory
rr1122
TrueTrue = = ReliabilityReliability
““Proportion of variance in scores that Proportion of variance in scores that can be considered ‘true’ variance”can be considered ‘true’ variance”
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5 •ReliabilityReliability
• Types of ReliabilityTypes of Reliability
• Internal consistencyInternal consistency
• StabilityStability
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ReliabilityReliability
Reliability coefficientReliability coefficientParallel formParallel formTest-retestTest-retestSplit-HalfSplit-HalfKuder-RichardsonKuder-RichardsonCronbach’s AlphaCronbach’s Alpha
See page 300, Table12.1See page 300, Table12.1
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7ReliabilityReliability
• Sources of ErrorSources of Error
• Inadequate sampling of itemsInadequate sampling of items• Cronbach’s alpha internal Cronbach’s alpha internal
consistency reliabilityconsistency reliability
• Different occasionsDifferent occasions• Stability reliabilityStability reliability
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8ValidityValidity
ContentContent
Criterion-relatedCriterion-related
PredictivePredictive ConcurrentConcurrent
Construct-relatedConstruct-related
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9Tests and MeasuresTests and Measures
Standardized Standardized (normative vs criterion)(normative vs criterion)
Buros Mental Measurements YearbookBuros Mental Measurements Yearbook
Tests in PrintTests in Print
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10Types of MeasuresTypes of Measures
Attitude MeasuresAttitude MeasuresLikertLikertSematic DifferentialSematic Differential
Aptitude TestsAptitude Tests Personality MeasuresPersonality Measures
ProjectiveProjectiveNon-projectiveNon-projective
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11Types of MeasuresTypes of Measures
Observation SystemsObservation Systems
Wholistic ScoringWholistic Scoring
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12Scoring and Data PreparationScoring and Data Preparation
Codebook Codebook (Codebook.doc)(Codebook.doc)
Coding Information (scaling)Coding Information (scaling)(Gatekeeper Final Data.(Gatekeeper Final Data.xlsxls))