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Reliability and Validity

What is Kappa and How Does It Measure Inter-rater Reliability?

by Audrey Schnell  2 Comments

The Kappa Statistic or Cohen’s* Kappa is a statistical measure of inter-rater reliability for categorical variables. In fact, it’s almost synonymous with inter-rater reliability.

Kappa is used when two raters both apply a criterion based on a tool to assess whether or not some condition occurs. Examples include:

[Read more…] about What is Kappa and How Does It Measure Inter-rater Reliability?

Tagged With: inter rater reliability, Kappa statistic, rules of thumb

Related Posts

  • What Is Reliability and Why Does It Matter
  • Inter Rater Reliability–A Few Good Resources
  • Member Training: Practical Advice for Establishing Reliability and Validity
  • How Big of a Sample Size do you need for Factor Analysis?

Member Training: Practical Advice for Establishing Reliability and Validity

by guest contributer 

How do you know your variables are measuring what you think they are? And how do you know they’re doing it well?

A key part of answering these questions is establishing reliability and validity of the measurements that you use in your research study. But the process of establishing reliability and validity is confusing. There are a dizzying number of choices available to you.

[Read more…] about Member Training: Practical Advice for Establishing Reliability and Validity

Tagged With: composite measures, composite score, Criterion and construct validity, Information Criterion, inter rater reliability, internal consistency, internal structure, Literature Review, measurement, parallel forms, patient reported, reliability, researcher evaluations, test-retest reliability, validity

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Member Training: Reporting Structural Equation Modeling Results

by Jeff Meyer 

The last, and sometimes hardest, step for running any statistical model is writing up results.

As with most other steps, this one is a bit more complicated for structural equation models than it is for simpler models like linear regression.

Any good statistical report includes enough information that someone else could replicate your results with your data.

[Read more…] about Member Training: Reporting Structural Equation Modeling Results

Tagged With: CFA, discriminant analysis, error term, factor loadings, Intercept, Latent Growth Curve Model, mean, mediation, parameter estimates, principal component analysis, reliability, reporting, SEM, Structural Equation Modeling

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What Is Reliability and Why Does It Matter

by Audrey Schnell  1 Comment

by Audrey Schnell, PhD

Some variables are straightforward to measure without error – blood pressure, number of arrests, whether someone knew a word in a second language.

But many – perhaps most –  are not. Whenever a measurement has a potential for error, a key criterion for the soundness of that measurement is reliability.

Think of reliability as consistency or repeatability in measurements. [Read more…] about What Is Reliability and Why Does It Matter

Tagged With: inter rater reliability, internal consistency, reliability, test-retest reliability

Related Posts

  • Member Training: Practical Advice for Establishing Reliability and Validity
  • What is Kappa and How Does It Measure Inter-rater Reliability?
  • Inter Rater Reliability–A Few Good Resources
  • Member Training: Reporting Structural Equation Modeling Results

Inter Rater Reliability–A Few Good Resources

by Karen Grace-Martin  4 Comments

Inter Rater Reliability is one of those statistics I seem to need just seldom enough that I forget all the details and have to look it up every time.

Luckily, there are a few really great web sites by experts that explain it (and related concepts) really well, in language that is accessible to non-statisticians.

So rather than reinvent the wheel and write about it, I’m going to refer you to these really great sites:

  • Computing Intraclass Correlations (ICC) as Estimates of Interrater Reliability in SPSS by Richard Landers
  • Statistical Methods for Rater and Diagnostic Agreement by John Uebersax

If you know of any others, please share in the comments.  I’ll be happy to add to the list.

Tagged With: inter rater agreement, inter rater reliability

Related Posts

  • What is Kappa and How Does It Measure Inter-rater Reliability?
  • What Is Reliability and Why Does It Matter
  • Member Training: Practical Advice for Establishing Reliability and Validity
  • Member Training: Reporting Structural Equation Modeling Results

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