Psychological statistics
use of statistics in psychology
Psychological statistics is application of formulas, theorems, numbers and laws to psychology.
Statistical methods for psychology include development and application statistical theory and methods for modeling psychological data.
These methods include psychometrics, factor analysis, experimental designs, and Bayesian statistics. The article also discusses journals in the same field.
Psychometrics
Psychometrics deals with measurement of psychological attributes. It involves developing and applying statistical models for mental measurements. The measurement theories are divided into two major areas: (1) Classical test theory; (2) Item Response Theory.
Classical test theory
The classical test theory or true score theory or reliability theory in statistics is a set of statistical procedures useful for development of psychological tests and scales. It is based on a fundamental equation,
X = T + E
where, X is total score, T is a true score and E is error of measurement. For each participant, it assumes that there exist a true score and it need to be obtained score (X) has to be as close to it as possible.
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