期刊名称：Discussion Papers / University of Leicester, Department of Economics
出版年度：2009
卷号：2009
出版社：Leicester
摘要：The method of instrumental variables (IV) and the generalized method of moments
(GMM) and their applications to the estimation of errors-in-variables and simultaneous equations
models in econometrics require data on a sufficient number of instrumental variables which are
(insert space)both exogeneous and relevant. We argue that in general such instruments (weak or
strong) cannot exist.
