• BlandAltman plot/limits of agreement (LOA) analysis
• Intraclass correlation coefficient
• Lin’s concordance correlation coefficient
• British standards reproducibility/repeatability coefficient
For all methods in this category, if repeat measurements per patient have not obviously been accounted for, then classify as acceptable.

• Mean square error/deviation
• Root mean square error/deviation
• Mean absolute error/deviation
• Accuracy
• Categorisation (e.g. proportion of time/measurements test within a threshold of gold standard)
• Descriptive only—plot of test against gold standard, or test and gold standard signals overlaid

• (Pearson’s) correlation coefficient
• T test
