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When two instruments or techniques are used to measure the same variable on a continuous scale, the BlandAltman plots can be used to estimate agreement. This plot is a scatter plot of the difference between the two measurements (Y-axis) against the average of the two measurements (X-axis).
Divide the numerator and denominator to get a quotient in the form of a decimal. For example, divide the numerator's value of two by the denominator's value of four to get the decimal 0.5. Multiply the quotient's value by 100 to get the percent agreement for the equation.
A score of 0 means that there is random agreement among raters, whereas a score of 1 means that there is a complete agreement between the raters. Therefore, a score that is less than 0 means that there is less agreement than random chance.
Accuracy refers to how closely the measured value of a quantity corresponds to its true value. Precision expresses the degree of reproducibility or agreement between repeated measurements. The more measurements you make and the better the precision, the smaller the error will be.
Method comparisonCorrelation coefficient. A correlation coefficient measures the association between two methods.Scatter plot. A scatter plot shows the relationship between two methods.Fit Y on X.Linearity.Residual plot.Average bias.Difference plot (Bland-Altman plot)Fit differences.More items...