Statistical assessment of analytical method transfer.

Analytical method transfer is an important part of analytical method development and maintenance. The current common practice of analytical method transfer is based on the equivalence of the means between the original laboratory and the receiving laboratory. However, for some assays the most scientifically sound approach would be to show the equivalency of individual sample readings between the two laboratories. In this study, statistical approaches such as limit of agreement, total deviation index, and tolerance interval approach to address individual equivalence between laboratories are discussed. Using a tolerance interval approach that is equivalent to the two one-sided hypothesis testing is proposed. These approaches are compared with each other and also with the mean equivalence approach on their statistical properties. Examples are presented to illustrate each analysis approach and the comparisons.