Psychometrics

On this page you fill find concepts relating to psychometrics, or the measurement of psychology.

Reliability

General Concepts

  • A brief reading about what reliability is and why it is important

  • A 10 minute video on the types of reliability

Internal Consistency

  • A 2 minute video on Cronbach’s alpha and how it relates to reliability.

  • A 3 minute video on calculating Cronbach’s alpha in SPSS

  • A  5 minute video on calculating Cronbach’s Alpha in Excel

  • A great introductory article discussing why you should use McDonald’s Omega over Cronbach’s Alpha most of the time.

Interrater Reliability

  • A brief reading on what Cohen’s Kappa is and how to calculate it by hand

  • An 8 minute video on calculating Cohen’s Kappa in SPSS

  • A brief reading on what an intraclass-correlation coefficient is, why you might use it, and how to calculate one

  • An article that gives a good overview of what intraclass-correlation coefficients are and the different types of ICCs

  •  A brief reading on Krippendorff’s Alpha, an alternative to Cohen’s Kappa. Discusses why you may use Alpha over Kappa and how to calculate it.

Validity

General Concepts

  • An 11 minute video on the types of validity