Mathematics and Statistics Support

Tests for reliability/consistency

Cronbachs alpha is used to check the internal consistency of a questionnaire scale. It gives a measure of whether the individual questions (items) are consistently measuring one underlying latent variable..

Agreement of observers or methods This set of techniques are used to assess agreement between the same measurements using either different raters or different methods e.g. two methods for measuring blood pressure. The chosen method is dependent on the type of data collected. For categorical data use Cohen's kappa (nominal data) or Weighted Kappa (ordinal data). For a continuous outcome use the Intraclass correlation (ICC).

Click on the download button to get the appropriate resource for the test and software package you want help with.
For more information on when to use each test, click on the test name.

Technique SPSS

R Sheet

R Script



Cronbachs alpha
Cohen's kappa
Intraclass correlation (ICC)
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