The aim is to compare two measurement methods. Therefore with each method two consecutive measurements were performed on 25 subjects (so overall 4 x 25 measured values) The relevant parameter is an amplitude.
To determine the reliability of each method, the “interindividual coefficient of variation” and the ”re-test coefficient of variation” should be calculated. I don’t really understand the difference and what is expressed by these two coefficients?
Does it make sense to calculate the “Intraclass correlation coefficient” (ICC, two way mixed)? Is it the same as the “re-test-Coefficient of variation”?
How should I proceed?