As a common interest rate model,CEV model (Constant Elasticity of Variance Model) has been widely used in the real life analysis. However,its unit root test has long been ignored or at most Dickey?Fuller Test is accepted as a valid test.

• CEV模型(ConstantElasticityofVarianceModel)作为常用的利率模型,在实证分析中得到了广泛运用,但是其单位根检验一直被忽略或者被默认可以使用迪基-富勒检验。