“…It is for this reason that many researchers use nonparametric approach. They include (Dorfman, 1992), (Chambers, Dorfman, & Wehrly, 1993), (Odhiambo & Mwalili, 2000), (Tsybakov, 2009), (Chandran & Prajneshu, 2004), and (Breidt & Opsomer, 2009) among others.…”