Psychometrics is the science that produces empirical evidence for survey instruments
Reliability, as grounded in Classical Test Theory (CTT), relates the the consistency, confidence, and precision of outcomes and survey instruments.
Validity is evidence of internal structure, consequences of testing, interpretability, generalizability, associations, and accuracy of outcomes and survey instruments.
In psychometrics, reliability evidence is usually generated first with a pilot study that postulates a given factor structure for the construct of interest. Validity evidence is then yielded in another larger study that confirms the theory and structure of the construct yielded in the pilot study and construct specification.
Psychometrics play a pivotal role in creating and validating assessment tools used in clinical practice.
Reliability and validity
Principal Components Analysis and Confirmatory Factor Analysis
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