**Data** The data is currently embargoed until 31st October 2024. Until then, researchers and educators are welcome to contact the lead author (Jenny Terry; jenny.terry@sussex.ac.uk) to request access to the data. The data is available in .csv files as a complete dataset and - due to its size - in its component parts, as follows: - smarvus_complete.csv – all data - smarvus_demo__meta.csv – demographics, Qualtrics meta-data, and key identifiers - smarvus_measures.csv – measurement scales - smarvus_maths_edu.csv – prior mathematics education data - smarvus_stats_edu.csv – statistics education data (from official records and self-reported) **Codebook** The codebook for the data (smarvus_codebook.csv) is applicable to all versions of the dataset and is broken down into sections corresponding to each component for ease of reference. **Data Processing** As well as the 'Data Processing Notes' in the codebook, a summary of all data processing applicable to the versions of the data presented here is provided (smarvus_data_processing.docx). **Errata** The linked document below contains a list of any errors, oddities, changes etc. about the data that have come to light since the data paper was published in May 2023. https://bit.ly/smarvus_errata Please raise any new issues with the project lead. [1]: https://bit.ly/smarvus_errata