“…For the practical use of the proposed estimator, we need to choose a kernel function and a bandwidth. Throughout the paper, we use the rule of thumb bandwidth
and use Epanechnikov kernel
as the kernel function following most of the literature (see, e.g., Ang & Kristensen,
2012; Chen et al.,
2012; Chen et al.,
2018; Yu and Huang, 2021; Yu et al.,
2023b; and many others. )…”