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https://www.selleckchem.com/pr....oducts/ly2880070.htm
Observational studies and experiments in medicine, pharmacology and agronomy are often concerned with assessing whether different methods/raters produce similar values over the time when measuring a quantitative variable. This article aims to describe the statistical package lcc, for are, that can be used to estimate the extent of agreement between two (or more) methods over the time, and illustrate the developed methodology using three real examples. The longitudinal concordance correlation, longitudinal Pearson correlation, and long