University of Mannheim

About: University of Mannheim is a education organization based out in Mannheim, Germany. It is known for research contribution in the topics: Context (language use) & Politics. The organization has 4448 authors who have published 12918 publications receiving 446557 citations. The organization is also known as: Uni Mannheim & UMA.

Testing for Serial Correlation in Fixed-Effects Panel Data Models

Abstract: In this paper, we propose various tests for serial correlation in fixed-eects panel data regression models with a small number of time periods. First, a simplified version of the test suggested by Wooldridge (2002) and Drukker (2003) is considered. The second test is based on the Lagrange Multiplier (LM) statistic suggested by Baltagi and Li (1995), and the third test is a modification of the classical Durbin-Watson statistic. Under the null hypothesis of no serial correlation, all tests possess a standard normal limiting distribution as N!1 and T is fixed. Analyzing the local power of the tests, we find that the LM statistic has superior power properties. Furthermore, a generalization to test for autocorrelation up to some given lag order and a test statistic that is robust against time dependent heteroskedasticity are proposed.

Entertainment 2.0? The Role of Intrinsic and Extrinsic Need Satisfaction for the Enjoyment of Facebook Use

Abstract: While intrinsic motivation has received broad attention in recent entertainment research, the effects of extrinsic motivation, such as social pressure to use media, on media enjoyment remain unknown. Based on an online-survey (N = 230), this study tested the effects of intrinsic need satisfaction and perceived social pressure on the enjoyment of Facebook use with structural equation modeling. The results reveal complex effects of extrinsic motivation: While social pressure negatively affected autonomy need satisfaction, it was positively related to competence and relatedness need satisfaction. This study is the first to develop and test a theoretical model of entertainment experience in the context of social media use and to theoretically integrate the role of extrinsic need satisfaction in media enjoyment.

Big Data in Survey Research AAPOR Task Force Report

Abstract: Recent years have seen an increase in the amount of statistics describing different phenomena based on “Big Data.” This term includes data characterized not only by their large volume, but also by their variety and velocity, the organic way in which they are created, and the new types of processes needed to analyze them and make inference from them. The change in the nature of the new types of data, their availability, and the way in which they are collected and disseminated is fundamental. This change constitutes a paradigm shift for survey research. There is great potential in Big Data, but there are some fundamental challenges that have to be resolved before its full potential can be realized. This report provides examples of different types of Big Data and their potential for survey research; it also describes the Big Data process, discusses its main challenges, and considers solutions and research needs.

Exercise after work, psychological mediators, and affect: A day-level study.

Abstract: In this diary study, we tested the recovery potential of exercise activities during leisure time and examined the psychological mechanisms underlying the relation between exercise activities and affect. We hypothesized that spending time on exercise activities after work will be related to subsequent affect in the evening, and that psychological detachment from work, sense of belonging, and physical self-perceptions explain why exercise activities are related to subsequent affect. One-hundred and twenty-six participants from diverse occupations completed a diary twice a day over five consecutive work days. Multilevel analyses showed that exercise activities after work were related to positive, but not to negative affect in the evening. As proposed, psychological detachment, sense of belonging, and physical self-perceptions mediated the relation between exercise activities after work and positive affect in the evening.