This data documents students' and mathematicians' written conceptions of proof. There are 176 files, including 45 mathematicians' conceptions (file names begin with 256322-256314) and 130 undergraduate students' conceptions (file names of the form XX.X). We also include a .csv file summarising a content analysis of all coding and the comparative judgment-based scores generated by expert and non-expert judges.
The repository is supplemental for Davies, Alcock and Jones (submitted to Journal of Mathematical Behavior, 2019).