2025 gglyph: Network-Style Visualization of Directed Pairwise Relationships Valentin Velev and Andreas Spitz 2025 CRAN package Website 2024 Economic Inequality and Public Support for Redistribution in Europe: A Cross-Sectional and Longitudinal Multilevel Analysis Valentin Velev and Alexander W. Schmidt-Catran International Journal of Public Opinion Research, 2024 DOI Code 2023 Replication of “Multilevel Models for the Analysis of Comparative Survey Data: Common Problems and Some Solutions” with R Valentin Velev SocArXiv, 2023 DOI