A fundamental concern for researchers who design and analyze experiments is that the experimental result might not be externally valid in another context. Researchers have traditionally attempted to assess external validity by comparing data from an experiment to other data. In this essay, I use insights from my recent work to show researchers how to begin the examination of external validity i...

Laboratory experiments provide the most rigorous method of testing scientific theories. However, their current use is primarily limited to testing theories of individual behavior. I suggest the conditions under which one can test theories of corporate behavior in laboratory experiments, using human subjects in the role of purposive corporate actors (such as groups or the state). Using the Condo...

Theory testing is as important as theory building in a nascent field like Electronic Commerce (EC). While there is a small but growing body of theoretical models of EC, the literature on empirical testing of beliefs, assumptions and models of EC is sparse, primarily due to difficulties in collecting relevant and detailed data from the field. Experimentation can provide a valuable alternative to...

The authors discuss the problem with failing to sample stimuli in social psychological experimentation. Although commonly construed as an issue for external validity, the authors emphasize how failure to sample stimuli also can threaten construct validity. They note some circumstances where the need for stimulus sampling is less obvious and more obvious, and they discuss some well-known cogniti...

ion levels in Table 3.2. Hence, the CE-based design is the result of an unbiased and systematic construction. Conclusion Validity: This type of validity is concerned with incorrect conclusions drawn about the relationship between the treatment and the outcome. This could arise from violating assumptions of statistical tests, having low statistical power, unreliable measurements and others. The ...

The purpose of this study was to identify possible subtypes of students with learning disabilities based upon gross motor functions. Subjects in a private school for learning difficulties were divided into a group of students with learning disabilities and a comparison group. Gross motor subtests from the Bmininks-Oseretsky Test of Motor Proficiency (Bruininks, 1978) were administered to both l...

Over the last decades, there has been a steady increase in the use of experimental methods in economics. We discuss the advantages of experiments for labour economics in this paper. Control is the most important asset behind running experiments; no other empirical method allows a similarly tight control as do experiments. Moreover, experiments produce replicable evidence and permit the implemen...

Mining Software Repositories (MSR) is an applied and practiseoriented field aimed at solving real problems encountered by practitioners and bringing value to Industry. Replication of results and findings, generalizability and external validity, UniversityIndustry collaboration, data sharing and creation dataset repositories are important issues in MSR research. Research consisting of bibliometr...

There is growing interest in discrete-choice experiments (DCE) as a method to elicit consumers' preferences in the health care sector. Increasingly this method is used to determine willingness-to-pay (WTP) for health-related goods. However, its external validity in the health care domain has not been investigated until today. This paper examines the external validity of DCE concerning the reduc...

A growing body of research suggests that accounting for studentspecific variability in educational data can improve modeling accuracy and may have implications for individualizing instruction. The Additive Factors Model (AFM), a logistic regression model used to fit educational data and discover/refine skill models of learning, contains a parameter that individualizes for overall student abilit...