“…As an extension of a general nesting spatial model for cross‐section data to a space‐time model for panel data, the SPDM has received increasing interest in recent literature due to the increased availability of panel datasets where spatial units are followed over time and the more modeling possibilities that panel datasets could offer for researchers (Anselin, Le Gallo, & Jayet, ; Elhorst, , ). In fact, the SPDM has been widely applied in recent literature on regional science (Arbia & Fingleton, ; Donfouet, Jeanty, & Malin, ; Elhorst & Fréret, ; Ramos, Suriñach, & Artís, ). The general expression of the SPDM is given as follows (Elhorst, ): where Y is an N × 1 vector of the dependent variable for every unit i ( i = 1, 2, …, N ) in one cross‐section, t is an index for the time dimension, X is an N × K matrix of independent variables.…”