Undisclosed Flexibility in Computing and Reporting Structural Equation Models in Communication Science

The use of structural equation modeling (SEM) in communication research has become increasingly popular in recent years, with SEM being commonly used as the primary method of data analysis in studies published within the field’s journals. However, despite its widespread use, there are persistent misapplications of SEM in published empirical studies in the communication sciences. Of these types of misuse, the most troubling are those related to the exploitation of flexibilities in data collection and analysis. Given the number of decisions that must be made when analyzing and reporting structural equation models, decisions which often remain undisclosed, the potential for researchers to exploit flexibilities in SEM research is high. To assess the extent of this problem, as well as the more longstanding types of misuse (i.e., omission of information and disclosed “bad practice”) identified by prior studies, we undertake a methodical review of studies employing structural equation modeling within major journals in the field of communication between the years 2007 and 2011. Articles were coded on the characteristics of the sample, characteristics of the model tested, as well as for various potential problems that we defined a priori. The most serious issues are identified, and recommendations for future standards in SEM research are suggested.     

Taxisin Aplysia dactylomela (Rang, 1828) to water-borne stimuli from conspecifics

Sixteen reproductively matureAplysia dactylomela were observed in a unidirectional stream under each of four conditions: sea water only, one sea hare, six sea hares, and a copulating sea hare pair. Streams containing conspecific stimulation were significantly more effective in eliciting a positive taxis towards the stimulus source. A copulating pair was not different from one or six animals in producing the approach. The sea hares showed a distinct final head orientation to six sea hares when compared with sea water only; final orientation did not differ in any other comparison.     

Impressions of ICOTS II

The following short contributions are from people who attended the Second International Conference on Teaching Statistics held in Victoria, August 1986     

Examining the extent and nature of online learning in American K-12 Education: The research initiatives of the Alfred P. Sloan Foundation

In 1992, the Alfred P. Sloan Foundation began its Anytime, Anyplace Learning Program, the purpose of which was to explore educational alternatives for people who wanted to pursue an education via Internet technology. Part of this grant activity was a research award to the Babson College Survey Research Group to examine online learning in American K-12 education. Three studies were conducted based on national surveys of school district and/or high school administrators. The focus of these studies was twofold: one, to examine the extent and nature of online learning in K-12 school districts; second, to examine the role of online learning in high school reform initiatives. The purpose of this article is to share the findings from these studies and to look critically at what they mean for the future of online learning in American K-12 schools.