Jonckheere-Terpstra test

The Jonckheere-Terpstra test is a statistical method used to determine if there is a meaningful trend across several ordered groups. For example, it can test whether increasing doses of a drug lead to a corresponding increase or decrease in a response, like blood pressure. Unlike tests that just compare groups, this one specifically looks for a consistent pattern—upward or downward—across the groups. It’s useful when you want to see if the data shows a clear, ordered trend rather than just differences without any pattern.