I need to calculate the minimal detectable change (MDC) for my dataset and found the following formula in several publications:
$MDC = 1.96 * SD * \sqrt(1-ICC) * \sqrt2$
They argue $\sqrt2$ is used, because of the uncertainty of two measurement timepoints. However, in my dataset I don't have just test-retest measurement, but indeed 7 different measurement timepoints, based on which I need to calculate the MDC. Do I need to exchange $\sqrt2$ by $\sqrt7$?