A number of conflicting conjectures have been proposed about the role of information and collusion in common-value auctions. This study investigates these hypotheses in an experimental setting by conducting a series of auctions with an equal number of signals (estimates of the object’s value) but a varying number of bidders among whom those signals are concentrated. Specifically, two types of c...

Under what conditions can cooperation be sustained in a network of strangers? Here we study the role of institutions and uncover a new behavioral foundation for the use of monetary systems. In an experiment, anonymous subjects could cooperate or defect in bilateral random encounters. This sequence of encounters was indefinite; hence multiple equilibria were possible, including full intertempora...

writing yet another editorial on pre-emptive analgesia when extensive editorials and reviews1–4 have been published within less than a year, and even in this Journal.5 In fact, pre-emptive analgesia is such a complex and controversial topic that it can be viewed from many different aspects. I would like to consider the significance of experimental results, like the ones reported by Nakamura and...

A new lattice estimate of K → 2π transitions claims, contrary to all other computations, that the hadronic matrix element for the gluon penguin operator Q6 has opposite sign and, in addition, is much larger than the vacuum saturation approximation. We comment under what conditions (if any) it is possible to reconcile this lattice result with the experimental value of ε/ε . The dramatic impact o...

For more than three decades, analyses of non-experimental data have reported considerable heterogeneity in teacher impacts on student achievement. We use data from a random-assignment experiment in Los Angeles Unified School District to test the validity of various non-experimental specifications. To do so, we first generated estimates for a group of teachers during a pre-experimental period an...

The present article provides a very basic introduction to Bayes’ theorem and its potential implications for medical research. This introduction was written to be accessible to medical researchers without much mathematical background in general or without much background in Bayesian mathematics specifically. I prove Bayesian equations from very basic probability theorems and also show how these ...

TinTO is an experimental system aiming at demonstrating the usefulness and feasibility of incrementally evaluated SQL queries for analyzing a wide spectrum of data streams. As application area we have chosen the technical analysis of stock market data, mainly because this kind of application exhibits sufficiently many of those characteristics for which relational query technology can be reasona...

Objective: Menopause is a normal biological process associated with hormonal and metabolic changes. The purpose of this study was to investigate the effect of combined training on estradiol levels and some metabolic risk factors in obese and overweight postmenopausal women. Materials and Methods: In this quasi-experimental study, 24 postmenopausal women were randomly divided into experimental ...