A number of methods for estimating trends in relative abundance based on standardized catch-per-unit-effort (CPUE) are discussed, including general linear and additive models, habitat-based standardization, neural networks, and regression trees. Methods and criteria for testing among various standardization techniques are presented and recommendations for future research are presented. Authors’

The immense popularity of Facebook with more than 1 billion active users continues to spark the attention of communication scholars. While much is known about Facebook members’ motivations, usage patterns, and gratifications obtained from this social networking site (SNS), minimal attention has been given to examine the perceived consumption and impact of Facebook on users themselves versus oth...

The eccentricity of a vertex is the maximum distance from it to another vertex, and the average eccentricity of a graph is the mean eccentricity of a vertex. In this paper we introduce average edge and average vertex-edge mean eccentricities of a graph. Moreover, relations among these eccentricities for trees are provided as well as formulas for line graphs and cartesian product of graphs. In t...