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Good scientific practice
You can find the most important rules and guidelines for safeguarding research integrity and good scientific practice here:
From the German Science Foundation DFG
DFG Guidelines for Safeguarding Good Research Practice - Code of Conduct in English; DFG Leitlinien zur Sicherung guter wissenschaftlicher Praxis - Kodex in German
The portal https://wissenschaftliche-integritaet.de/ is currently (29/04/2021) only available in German; an English version has been announced for 2021, so stay tuned!
From the University of Cologne
Satzung der Kommission zur Sicherung guter wissenschaftlicher Praxis der Universität zu Köln in German (Statutes of the Commission for safeguarding good scientific practice at the University of Cologne - GSGS version for internal use only; no official English version is available yet, as per 29/04/2021)
Guideline on the Handling of Research Data at the University of Cologne in English; Leitlinie zum Umgang mit Forschungsdaten an der Universität zu Köln in German
University of Cologne - Research Code of Conduct in English; Universität zu Köln - Research Code of Conduct in German
On Statistics
Data Sets Are Foundational to Research. Why Don’t We Cite Them?
How scientists can stop fooling themselves over statistics
On avoiding Bullying, Dicrimination and Harrassment
Popp, A. L., C. A. Hall, and Y. A. Yılmaz (2020), How to combat bullying and discrimination in the geosciences, Eos, 101, https://doi.org/10.1029/2020EO151914. Published on 24 November 2020.