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91.
Generalized linear mixed models are a widely used tool for modeling longitudinal data. However, their use is typically restricted to few covariates, because the presence of many predictors yields unstable estimates. The presented approach to the fitting of generalized linear mixed models includes an L 1-penalty term that enforces variable selection and shrinkage simultaneously. A gradient ascent algorithm is proposed that allows to maximize the penalized log-likelihood yielding models with reduced complexity. In contrast to common procedures it can be used in high-dimensional settings where a large number of potentially influential explanatory variables is available. The method is investigated in simulation studies and illustrated by use of real data sets. 相似文献
92.
Andreas Friedl Katharina Lima de Miranda Ulrich Schmidt 《Journal of Risk and Uncertainty》2014,48(2):97-109
This paper analyzes whether social comparison can explain the low take-up of disaster insurance usually reported in field studies. We argue that risks in the case of disasters are highly correlated between subjects whereas risks for which high insurance take-up can be observed (e.g. extended warranties or cell phone insurance) are typically idiosyncratic. We set up a simple model with social reference points and show that in the presence of inequality aversion social comparison makes insurance indeed less attractive if risks are correlated. In addition we conducted a simple experiment which confirms these theoretical results. The average willingness to pay for insurance is significantly higher for idiosyncratic than for correlated risks. 相似文献
93.
Dr. Klaus Geissdörfer Prof. Dr. Ronald Gleich Prof. Dr. Andreas Wald 《Zeitschrift für Betriebswirtschaft》2009,79(6):693-715
Tremendous increases in indirect costs can be found in many industries. Consequently, life cycle cost analysis models are getting more important in strategic cost management. However, existing models differ significantly from each other as they have been developed mainly for specific applications. In order to enable a common use of those models, a standardization of these models is required. We examine the potentials of standardizing models for life cycle cost analysis. In a first step, requirements regarding a standard model are derived from literature. As a second step, existing approaches found in literature are compared to the afore derived demands and it is analyzed to what extent they match the standardization requirements. Based on this comparison, we identify and discuss avenues for further research. 相似文献
94.
Few studies have moved beyond the dyadic level of an ongoing alliance and examined factors contributing to the success of entering a series of alliances. In this paper we expect biotechnology firms over time to learn from their alliance experience and to develop general alliance capabilities. Specifically, we expect the speed with which they enter into new research alliances, e.g. their alliance formation rate, to be affected by capabilities built up in prior alliances as well as by characteristics of their partners. We use longitudinal event history data for the complete population of US biotechnology firms for 1973–1999 to test four hypotheses about factors affecting the rate of new alliance formation. Our analysis suggests that the speed of entering research alliances is affected by prior experience of the focal firm, but not by partner characteristics. Our findings provide evidence that biotech firms learn how to learn more effectively from multiple research alliances; however, this effect is generalized and not tied to specific characteristics of the alliance partner. 相似文献
95.
In modern football, various variables as, for example, the distance a team runs or its percentage of ball possession, are collected throughout a match. However, there is a lack of methods to make use of these on-field variables simultaneously and to connect them with the final result of the match. This paper considers data from the German Bundesliga season 2015/2016. The objective is to identify the on-field variables that are connected to the sportive success or failure of the single teams. An extended Bradley–Terry model for football matches is proposed that is able to take into account on-field covariates. Penalty terms are used to reduce the complexity of the model and to find clusters of teams with equal covariate effects. The model identifies the running distance to be the on-field covariate that is most strongly connected to the match outcome. 相似文献
96.
Noémie Jacoby Hella J. Schubert Gerit Loeffler Andreas Heinz Chantal P. Mörsen 《International Gambling Studies》2013,13(2):240-254
The objective of the present study was to differentiate specific migration-related factors that can account for an increased vulnerability to pathological gambling (PG) among migrants in Germany. One hundred and six gamblers (61 migrants, 45 Germans) with varying degrees of gambling problems participated in the study. We analysed (1) differences between migrants and Germans regarding gambling patterns, severity of gambling problems, motivation and craving; influence of (2) acculturative stress; (3) acceptance and popularity of gambling in the culture of origin on gambling problems; (4) differences between migrants and Germans regarding family gambling and peer gambling; and (5) differences in religiosity and its influence on gambling problems. Results suggest no differences between migrants and Germans regarding gambling patterns and the severity of gambling problems. However, findings indicate that migrants have higher motivation and craving to gamble. Findings further suggest that acculturative stress is associated with more severe gambling problems. In contrast, acceptance and popularity of gambling in the country of origin was not a significant predictor of gambling problems. At the same time, family gambling and peer gambling was significantly more prevalent among migrants, constituting an additional risk factor in the present sample. On the other hand, migrants in the sample benefit more often from a protective influence of religiosity. 相似文献
97.
Ass.-Prof. Mag. Dr. Arthur Drexler Prof. Andreas Wieser Dr. Christof Netzer 《Organisationsberatung, Supervision, Coaching》2011,18(2):181-194
This study evaluates the effects of life-coaching for high-level managers in an approved regeneration-center in Tyrol/Austria. This type of life-coaching consists of four steps, namely to analyze the life-situation, to de-block in case of disorders, to transform realizations into new attitudes and finally to integrate optimized thinking- and behavioral pattern in the daily routine. The effects of life-coaching were evaluated with a sound multimethodical design and the use of a control group. Results show that there is full satisfaction with the effectiveness of the entire treatment, but also there are significant differences between the groups with and without coaching. 相似文献
98.
Prof. Dr. Ralf Diedrich Prof. Dr. Stefan Dierkes Dr. Hans-Christian Gr?ger 《Zeitschrift für Betriebswirtschaft》2011,81(6):657-675
Drukarczyk and Lobe argue that the value of a company depends on individual preferences for leveraged or unleveraged companies if debt and credit interest rates after personal taxes differ. Consequentially they derive two preference-dependent valuation formulas. Based on these results an increasing amount of literature proposing preference-dependent valuation formulas emerged. We claim that this has to be viewed critically. In order to show that even in a world of different debt and credit interest rates after personal taxes a market value can be determined we develop a new version of the Tax CAPM. Based on this model the market value of leveraged and unleveraged companies is derived. Finally we show that the corresponding valuation function significantly differs from the preference-dependent valuation formulas. 相似文献
99.
Karl-Wilhem Grümer 《KZfSS K?lner Zeitschrift für Soziologie und Sozialpsychologie》2011,63(4):705-713
Nachrichten und Mitteilungen
Mitteilung Preis der Fritz Thyssen Stiftung für sozialwissenschaftliche Aufs?tze (Begründet durch Prof. Dr. Dr. h.c. Erwin K. Scheuch †), Zeitschriftenjahrgang 2010 相似文献100.
Henrietta Grönlund 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2011,22(4):852-874
Volunteering motivation has been studied from many perspectives during the last few decades. These studies have increased
our understanding on the individual, dynamic, and reflexive nature of volunteering. Moreover, research that combines volunteering
with the concept of identity or role identity has deepened this understanding. Nevertheless, the ways individual volunteers
experience and associate volunteering with their personal identities has been little studied. Values can provide an empirical
window into the core of personal identity. Identity, values, and volunteering are combined in the approach used in this study,
which introduces the theoretical viewpoints of narrative identity and value identity. The analyses of 24 life course interviews
demonstrated volunteering can be used in identity work for expressing the core values of individuals. The results also indicate
the variety and range of values, which can be associated with volunteering. 相似文献