|Title:||A robust test for homoscedasticity in nonparametric regression|
|Abstract:||We consider a nonparametric location scale model and propose a new test for homoscedasticity (constant scale function). The test is based on an estimate of a deterministic function which vanishes if and only if the hypothesis of a constant scale function is satisfied and an empirical process estimating this function is investigated. Weak convergence to a scaled Brownian bridge is established, which allows a simple calculation of critical values. The new test can detect alternatives converging to the null hypothesis at a rate n^(-1/2) and is robust with respect to the presence of outliers. The finite sample properties are investigated by means of a simulation study, and the test is compared with some non-robust tests for a constant scale function, which have recently been proposed in the literature.|
|Subject Headings:||Brownian Bridge|
robust test for heteroscedasticity
|Appears in Collections:||Sonderforschungsbereich (SFB) 823|
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