If the journal requires me to provide a data appendix, how should I prepare?

A data appendix provides supplementary materials supporting research findings and enhancing reproducibility. Most journals require this component when submitting empirical studies to verify analytical claims. Preparation must strictly adhere to specific journal guidelines detailing acceptable formats, repository preferences, and documentation standards. Ensure all datasets undergo thorough anonymization to protect participant confidentiality and comply with ethical regulations. Include comprehensive metadata and a detailed README file explaining variables, data structures, cleansing procedures, and analytical scripts. Verify that submitted data precisely aligns with results presented within the manuscript and possesses necessary permissions for sharing. Organize supplementary files logically into distinct sections for datasets, code, and documentation. Utilise trusted repositories like Dryad, Zenodo, or OSF, acquiring persistent identifiers (DOIs) for permanent access links. Reference these identifiers explicitly within the manuscript's methods section and appendix. Prior to submission, rigorously test deposited materials to guarantee independent replication of core findings using the provided resources. Adherence to best practices strengthens transparency and enables secondary analysis.