Special Volume: Numerical Optimization in R: Beyond optim (Editor: Ravi Varadhan)

Special Volume: Graphical User Interfaces for R (Editors: Pedro M. Valero-Mora, Rubén D. Ledesma)

Special Volume: Psychoco: Psychometric Computing in R (Editors: Florian Wickelmaier, Carolin Strobl, Achim Zeileis)

Special Volume: State of the Multiple Imputation Software (Editor: Recai M. Yucel)

Special Volume: Magnetic Resonance Imaging in R (Editors: Karsten Tabelow, Brandon Whitcher)

Special Volume: Political Methodology (Editors: Micah Altman, John Fox, Simon Jackman, Achim Zeileis)

Special Volume: Statistical Software for State Space Methods (Editors: Jacques J. F. Commandeur, Siem Jan Koopman, Marius Ooms)

Special Volume: Competing Risks and Multi-State Models (Editor: Hein Putter)