-
作者：Chin, Aimee; Juhn, Chinhui; Thompson, Peter
作者单位：University of Houston System; University of Houston; State University System of Florida; Florida International University
摘要：Using a large, individual-level wage data set, we examine the impact of a major technological innovation-the steam engine-on the demand for skills in the merchant shipping industry. We find that the technical change created a new demand for engineers, a skilled occupation. It had a deskilling effect on production work-moderately skilled able-bodied seamen were replaced by unskilled engine room operatives. On the other hand, able-bodied seamen, carpenters, and mates employed on steam vessels ea...
-
作者：Heckman, James J.; Urzua, Sergio; Vytlacil, Edward
作者单位：University of Chicago; University College Dublin; Columbia University
摘要：This paper examines the properties of instrumental variables (IV) applied to models with essential heterogeneity, that is, models where responses to interventions are heterogeneous and agents adopt treatments (participate in programs) with at least partial knowledge of their idiosyncratic response. We analyze two-outcome and multi ple-outcome models, including ordered and unordered choice models. We allow for transition-specific and general instruments. We generalize previous analyses by devel...
-
作者：Gilboa, Itzhak; Lieberman, Offer; Schmeidler, David
作者单位：Tel Aviv University; Yale University; Tel Aviv University; University System of Ohio; Ohio State University
摘要：An agent is asked to assess a real-valued variable Y-p based on certain characteristics X-p = (X-p(1)..., X-p(m)), and on a database consisting of (X-i(1),..., X-i(m), Y-i) for i = 1,..., n. A possible approach to combine past observations of X and Y with the current values of X to generate an assessment of Y is similarity-weighted averaging. It suggests that the predicted value of Y, (Y) over bar (s)(p), be the weighted average of all previously P observed values Y-i, where the weight of Y-i ...
