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Psychometrics - Fossati
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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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