This note provides the weak-instrument asymptotic distributions of Hahn and Hausman’s (2002) tests for instrument validity. These distributions are used to compute asymptotic rejection rates when instruments are weak and, as a special case, irrelevant. These tests were proposed as pretests, and the asymptotic properties of post-test inferences, conditional on the tests failing to reject instrum...

With the rise of corporate failures and conflict interest arising from shareholders management, there have been growing concerns in governance (CG). It is ponsibility board director CG to oversee management as well firm performance make accountable shareholders. Hence this research examines connection between firms’ features using size, independence addition age a proxy for characteristics turn...

Almost every major consulting firm offers a variation on IT benchmarking or knowledge management to help companies improve their resource use and gauge the efficacy of their IT investments. Despite the perceived importance that such ubiquitous offerings imply, general evidence for any productivity enhancements did not appear until 1996 (Brynjolfsson & Hitt). The continued absence of productivit...

We generalize an empirical likelihood approach to missing data to the case of consumer credit scoring and provide a Hausman test for nonignorability of the missings. An application to recent consumer credit data shows that our model yields parameter estimates which are significantly different (both statistically and economically) from the case where customers who were refused credit are ignored.

We show in this chapter that selective aphasic deficits dissociate distinct language processing systems. To this end, we focus on disruptions of lexical access that appear to implicate initial stages of sentence comprehension. The analyses we present turn on comparisons between agrammatic (Broca's) aphasic patients and paragrammatic (Wernicke's) aphasic patients. By the former we mean roughly, ...

The standard static model of the e¤ect of welfare programs on labor supply is newly estimated with maximum response heterogeneity. Both reduced form and structural models are estimated allowing response heterogeneity whose shape is estimated nonparametrically. Estimated marginal treatment e¤ects representing the e¤ect of program participation on labor supply for the historical AFDC program are ...