Analysing the relationship between ectomycorrhizal infection and forest decline using marginal models

This statistical survey originates from the problem of discovering which relationship exists between root ectomycorrhizal infection and health status of forest plants. The sampling scheme takes observations from roots that come from sectors around the tree resulting in a hierarchical association structure of the observations. Marginal regression models are used to analyze the mean effect of the ectomycorrhizal state on a response variable proxy for the health degree of the plants

C++ Utilities zur Implementierung statistischer Verfahren unter Berücksichtigung fehlender Werte

Die hier vorgestellten Erweiterungen der bereits bestehenden generischen Bibliothek zur linearen Algebra (Fieger, A., Heumann, C., Kastner, C., Watzka, K., 1997:(Discussion Paper 63) stellen Funktionen bereit, die bei der Implementierung statistischer Verfahren benötigt werden. Besondere Beachtung findet der Umgang mit fehlenden Daten

WinMAREG Quick Start

This paper is a short introduction into the usage of WinMAREG. Two examples are used to illustrate the most common options and features of the software

Generische Bibliothek zur Linearen Algebra und zur Simulation in C++

Die hier vorgestellte Bibliothek implementiert in statistischen Anwendungsprogrammen haeufig benoetigte Bausteine in einer objektorientierten Sprache. Eine solche Bibliothek tritt ihrem Anwender nicht als "black box" entgegen, sondern ist mit vertretbarem Aufwand erweiterbar und spezialisierbar

MAREG and WinMAREG

This paper describes a software tool for marginal regression methods. MAREG currently handles binary, categorical and continious data with several link functions. Although intended for the analysis of correlated data, uncorrelated data can be analysed. We supplies two different approaches for these problems-Maximum Likelihood and GEE methods. Handling of missing data is also provided. [ Published in: Computational Statistics and Data Analysis, 24, 235-241

New features in MAREG 0.2.0

This paper describes changes in the software tool MAREG from version 0.0.7 (July 1997) to version 0.2.0 (June 1999). As these new features are not implemented in WinMAREG yet, they can only be used via editing the ini-files (*.cai). Handling and features of Version 0.0.7 are described in Fieger, Heumann and Kastner (1996), Fieger, Heumann and Kastner (1998) and Kastner, Fieger and Heumann (1997)