Reliability and Agreement Tests

Reliability and item analysis Item Total Correlation: Formula, Interpretation, SPSS, Python, R and Excel The item total correlation measures the Pearson association between each item and…

Same-rater repeatability across fixed sessions Intra-Rater Reliability: 7 Essential Steps, ICC Formula and Worked Example Intra-rater reliability measures how consistently the same rater, examiner, coder, instrument…

Agreement among quantitative ratings Inter Rater Reliability: 7 Essential Steps, ICC Formula and Worked Example Inter rater reliability describes how consistently two or more raters, graders,…

Internal consistency reliability lower bound Guttman’s Lambda-6: 7 Essential Steps, Formula and Worked Example Guttman’s Lambda is a family of six lower-bound reliability coefficients. This guide…

Reliability and agreement guide Split Half Reliability: 7 Essential Steps, Formula and Worked Example Split half reliability estimates internal consistency by dividing one instrument into two…

Chance-corrected agreement for ordered categories Weighted Kappa: Formula, Interpretation, Example, Python, R, SPSS and Excel Guide Weighted kappa measures agreement between two ratings made on the…

Internal consistency, scale reliability and item diagnostics Cronbach’s Alpha: Formula, Interpretation, Good Values, SPSS, Python, R and Excel Cronbach’s Alpha is one of the most widely…

Paired quantitative agreement analysis Bland Altman Plot: Formula, Interpretation, Python, R, SPSS and Excel Guide A Bland Altman plot evaluates agreement between two paired quantitative measurements…