Abstract Online advertisements have become one of today’s most widely used tools for enhancing businesses partly because their compatibility with A/B testing. testing allows sellers to find effective advertisement strategie,s such as ad creatives or segmentations. Even though several studies propose a technique maximize the effect an advertisement, there is insufficient comprehension customers’...

In the realm of empirical research, investigators are first and foremost concerned with the validity of their results, but validity is a multi-dimensional ideal. In this article we discuss two key dimensions of validity – internal and external validity – and underscore the natural tension that arises in choosing a research approach to maximize both types of validity. We propose that the most co...

One way to study language evolution is to compare human communication with closely related non-human primate species. This comparative approach has turned to be especially productive if subjects are studied under natural field conditions in which they have evolved. Various observation techniques have been developed, but field experiments are often needed to clarify underlying cause-effect relat...

We overview the use of field experiments in labor economics. We showcase studies that highlight the central advantages of this methodology, which include: (i) using economic theory to design the null and alternative hypotheses; (ii) engineering exogenous variation in real world economic environments to establish causal relations and learn about the underlying mechanisms; and (iii) engaging in p...

The MSAT-X/AUSSAT experiment offered the first true land-mobile satellite configuration to evaluate the MSAT-X technologies and equipment. Both quantitative data tests and qualitative voice link demonstrations were successfully conducted. From the collected data, system performance in typical land-mobile conditions was extracted. A set of propagation characteristics corresponding to the wide ra...

Introduction The assessment of local diffusion anisotropy in tissue using diffusion tensor imaging (DTI) is known to be problematic in regions that contain an admixture of tissue types or multiple fiber orientations. One approach to ameliorating this problem is to acquire high angular resolution qspace data, augmented with more sophisticated analysis schemes using higher order tensor models. Ho...