Magnus, Jan R.; Wang, Wendun - In: Oxford Bulletin of Economics and Statistics 76 (2014) 6, pp. 874-897
type="main" xml:id="obes12068-abs-0001" <title type="main">Abstract</title> <p>In specifying a regression equation, we need to specify which regressors to include, but also how these regressors are measured. This gives rise to two levels of uncertainty: concepts (level 1) and measurements within each concept (level 2). In...</p>