Validity of Claims and Construct Validity

Assessing Validity of Claims

• Validity: Appropriateness of a claim, judged by reasonableness, accuracy, and justifiability.
• Claims based on research are only as strong as the research itself.
• Four Big Validities: Construct, External, Statistical, Internal

Construct Validity

• Focuses on how well constructs in a claim are operationalized.
• Constructs: Broad, abstract concepts (e.g., happiness, intelligence, confidence).
• Operationalization: Defining a construct in a measurable way.
• E.g., Measuring happiness by counting smiles.
• Assessing construct validity involves evaluating the appropriateness of the operationalization.

Ways to Operationalize Constructs

• Self-Report Measures: Surveys or interviews where participants answer questions.
• E.g., Rating happiness on a scale of 1 to 10.
• Observational Measures (Behavioral Measures): Inferring constructs from observed behaviors.
• E.g., Measuring happiness by counting the number of smiles.
• Physiological Measures: Recording biological data from the body.
• E.g., Measuring brain activity or cortisol levels.

Examples of Construct Validity

• Stress: Can be measured through self-report (asking how stressed one feels), observational measures (assessing facial expressions), or physiological measures (measuring cortisol levels).
• Obesity: Can be measured using BMI, although this is not considered a great measure of obesity anymore by a lot of people.
• Intelligence: Measured through specific ability tests.
• Gender: Operationalized as what's on birth certificate.