Lecture Six: Measurement, Reliability, and Validity

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Lecture Six Measurement, Reliability, and
Validity

• A. Levels of Measurement
• B. Measurement Reliability
• C. Validity

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A. Levels of Measurement

• Nominal
• Ordinal
• Interval
• Ratio
• Scaling measure magnitude, semantic
  differential, likert, Thurstone, Guttman

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B. Measurement Reliability

• Stability and Consistency
• Reliability ranges from 0-1.0
• Acceptable reliability .80
• Tests of
• Test Retest
• Inter-coder Agreement
• Internal Consistency Cronbachs alpha

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C. Validity

• Internal and External
• Measurement
• Concurrent Validity
• Discriminant Validity
• Construct Validity