“…More generally, Yang (2015) developed higher-order bias and variance corrections by means of stochastic expansions and bootstrap for a class of non-linear models that includes SAR as a special case. More recently, Martellosio and Hillier (2019) derived refined estimates of the spatial parameter of SARs by centring the associated profile score function, and constructed confidence sets using a Lugannani-Rice approximation. So far as improved tests are concerned, various refinements of test statistics have been derived by Cliff and Ord (1981), Robinson (2008), Baltagi and Yang (2013), Robinson andRossi (2014, 2015), Liu and Yang (2015) and Jin and Lee (2015).…”