Selected Topics in Applied Econometrics, Ebru Çağlayan Akay,Özge Korkmaz, Editör, Peter Lang Publishing, Inc., Berlin, ss.31-45, 2019
t Panel data models can take different forms as depending on parameters which
are changed by units and time. Heterogeneous panel data models are called when all
parameters vary by units and/or time. If the dimension is more than two in a panel data
model, the model is called as multi-dimensional panel data model, and the parameters
can be heterogeneous by one or more dimensions. In this study, estimation methods
are proposed for heterogeneous multi-dimensional panel data models, and homogeneity
tests are extended to this model. The validity of Okun’s Law was examined for European
Countries at NUTS2 level in 2008–2016.