Lu, Zudi; Tjøstheim, Dag; Yao, Qiwei - In: Statistics & Probability Letters 78 (2008) 18, pp. 3145-3151
For spatio-temporal regression models with observations taken regularly in time but irregularly over space, we investigate the effect of spatial smoothing on the reduction of variance in estimating both parametric and nonparametric regression functions. The processes concerned are stationary in...