Ali, Arif, Abdur Rasheed, Afaq Ahmed Siddiqui, Maliha Naseer, Saba Wasim, and Waseem Akhtar. 2015. “Non-Parametric Test for Ordered Medians: The Jonckheere Terpstra Test”. International Journal of Statistics in Medical Research 4 (2):203-7. https://doi.org/10.6000/1929-6029.2015.04.02.6.