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Psychometrics - Fossati
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Psychometrics in public health involves creating reliable and valid measures like tests and interviews to assess psychological constructs. It uses mathematical models to link these constructs with observable variables. Measurement scales (nominal, ordinal, interval, ratio) are crucial for quantifying attributes. Standardized tests ensure consistency in administration and scoring. Item Response Theory and Classical Test Theory provide models for scaling attributes, with IRT focusing on latent traits and test items' difficulty and discrimination. The SEM measures the precision of test scores, indicating how reliable they are as estimates of true values.
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- Psychometrics involves mathematical and statistical models to define measures in psychology, focusing on relating psychological constructs to observable variables.
- Aims of psychometrics include developing reliable and valid measures, creating new measurement models, and assessing measure performance across different samples.
- Measurement scales (nominal, ordinal, interval, ratio) are used to quantify attributes or categorize objects, with each scale providing distinct information about the characteristics being measured.
- Standardized tests ensure consistency in administration and scoring, providing objective, quantifiable, and generalizable measures of behavior.
- Item Response Theory models the probability of correct item responses based on latent traits, using item characteristic curves to assess discrimination and difficulty.
- Classical Test Theory posits that test scores are the sum of true scores (error-free) and error scores, with standard error of measurement indicating precision and reliability.
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