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pretreatment covariate due to a particular “ M -Structure” between two latent factors, an observed treatment, an outcome, and a … covariate is generally the superior choice. As an application, we re-examine a controversial example between Professors Donald …
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An IV approach, using as instruments nonlinear transformations of the lagged levels, is explored to test for unit roots in panels with general dependency and heterogeneity across cross-sectional units. We allow not only for the cross-sectional dependencies of innovations, but also for the...
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Purpose – The ongoing availability of existing industrial systems/machines depends to a great extent on the form and level of product support. Product support, or the after sale service of a product, is important because it assures the expected function of the product in its operational phase....
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