Many social experiments are run in multiple waves, or are replications of earlier social experiments. In principle, the sampling design can be modified in later stages or replications to allow for more efficient estimation of causal effects. We consider the design of a two-stage experiment for estimating an average treatment effect, when covariate information is available for experimental subje...

Page 1 Rough Draft A Bestiary of Experimental & Sampling Designs In an experimental study, we have to decide on a set of biologically realistic manipulations that include appropriate controls. In an observational study, we have to decide which variables to measure that will best answer the question we have asked. These decisions are very important, but they are not the subject of this chapter. ...

The long history of categorization experiments indicates that many important design choices can critically affect the quality of the resulting data. Unfortunately, the optimal choices depend on the goals of the experiment, so there is no single template that a new researcher can follow. This chapter describes methods needed to design effective categorization experiments, and specialized methods...

For years the Aspect Oriented Software Development community has promoted aspects as a solution to complexities introduced by implementing crosscutting concerns. And while a lot of research focuses on advancing the state of the art of aspect oriented programing and design, there is still no (reported) wide-spread industrial adoption of Aspect Oriented Programming. In this paper we report on an ...

The data from developmental neurotoxicity (DNT) guideline studies present a number of challenges for statistical design and analysis. The importance of specifying the planned statistical analyses a priori cannot be overestimated. A review of datasets submitted to the US Environmental Protection Agency revealed several inadequate approaches, including issues of Type I error control, power consid...

In this study, the possibility of producing coal with less than 11% ash from tailings of flotation process was investigated. The effect of six flotation parameters: collector type, collector consumption, frother type, frother consumption, pulp density and mixing rate were studied on a sample from a tailing dam. A software based experimental design approach (DX7) was applied to determine and mod...

During the course of an experiment using animals, many variables (e.g., age, body weight at several times, food and water consumption, hematology, and clinical biochemistry) and other characteristics are often recorded in addition to the primary response variable(s) specified by the experimenter. These additional variables have an important role in the design and interpretation of the experimen...