Castle, Jennifer L.; Hendry, David F. - In: Journal of Econometrics 158 (2010) 2, pp. 231-245
A new test for non-linearity in the conditional mean is proposed using functions of the principal components of regressors. The test extends the non-linearity tests based on Kolmogorov-Gabor polynomials ([Thursby and Schmidt, 1977], [Tsay, 1986] and [Teräsvirta et al., 1993]), but...