Hyperactivity of the adrenal cortex in human subjects due to malignant neoplasm, hyperplasia or stimulation by adrenocorticotropic hormone (ACTH) has frequently been observed to be associated with the urinary excretion of considerable amounts of various C21 20-methylsteroids (see Table 1). possibility and because of the widespread therapeutic use of 17-hydroxy-1 1-dehydrocorticosterone (cortiso...

Minimizing Bias in Selection on Observables Estimators When Unconfoundness Fails We characterize the bias of propensity score based estimators of common average treatment effect parameters in the case of selection on unobservables. We then propose a new minimum biased estimator of the average treatment effect. We assess the finite sample performance of our estimator using simulated data, as wel...

This paper surveys the empirical evidence on causal effects of educatio studies in the light of their underlying identifying assumptions. We work o which lead to rather different interpretations of the estimated causal effect extend causal return estimates are informative regarding educational policy Despite the substantial methodological differences, we have to conclude t and do not deviate su...

Abstract: The ethanol extract of Cynanchum ascyrifolium Matsum. showed significant anti-inflammatory and immunosuppressive activities with dose dependent manner using in vitro experiments. Then, the bioassay-guided ethanol extract lead to identification of four active compounds, namely ursolic acid (1), maslinic acid (2), cynanoside A (3) and syringaresinol (4). Among these compounds, cynanosid...

This paper proposes a fully nonparametric procedure to evaluate the effect of a counterfactual change in the distribution of some covariates on the unconditional distribution of an outcome variable of interest. In contrast to other methods, we do not restrict attention to the effect on the mean. In particular, our method can be used to conduct inference on the change of the distribution functio...

This paper examines the employment effects of acquisitions for acquired European firms taking non-random selection of acquisition targets explicitly into account. Following the empirical firm growth literature and theories put forward in the mergers and acquisition (M&A) literature we control for convergence dynamics in firm size and distinguish between different types of acquisitions. Empirica...

Currently available asymptotic results in the literature suggest that matching estimators have higher variance than reweighting estimators. The extant literature comparing the finite sample properties of matching to specific reweighting estimators, however, has concluded that reweighting performs far worse than even the simplest matching estimator. We resolve these puzzling conclusions. Specifi...

This research analyses through the use of instrumental variables estimation whether democracy has an effect on variables belonging to three different categories: fiscal policy, inequality in income distribution and political instability. It shows there is no stable relation between democracy and fiscal policy variables between countries of the sample in the 1978-1988 period. Democracy, on the o...