Contains data and supplementary materials for the experimental part of the *Communicating vaccination coverage: Testing the selfish versus the social rationality hypothesis* project. Data are organized into folders. <br/> 📁**01 Symptom severity pretest** Contains data from the pretesting of the severity of 62 symptoms (relating to infectious diseases and vaccine-adverse events). `codebook_severitypretest.csv`: codebook (the names of the symptoms are provided in both Serbian and English) `data_severitypretest.csv`: dataset `descriptives_severitypretest.csv`: descriptive statistics (range, min, max, mean, standard error of the mean, standard deviation, variance for each symptom rating) `questionnaire_severitypretest.pdf`: exported SoSci survey in Serbian (some information redacted for peer-review) `report_severitypretest.pdf`: a report on the pretest procedures and results <br/> 📁**02 Pilot experiment** Contains data from the pilot experiment conducted in March-April 2019 (*N* = 75 adult participants residing in Serbia). `code_vax00.R`: code to reproduce all analyses, tables, and figures from the report `data_vax00.csv`: dataset `questionnaire_vax00.pdf`: exported SoSci survey in Serbian (some information redacted for peer-review) `report_vax00.pdf`: a report on Pilot experiment methods and results `values_vax00_en.csv`: question response labels translated into English `variables_vax00_en.csv`: question text translated into English <br/> 📁**03 Experiment 1** Contains data from the experiment conducted in April 2021 (191 responses in the dataset; final sample was *N* = 174 adult participants residing in Serbia). `code_vax01.R`: code to reproduce all analyses, tables, and figures in the manuscript `data_vax01.csv`: dataset `preregistration_for-peer-review_vax01.pdf`: an anonymized copy of an AsPredicted preregistration (for peer-review only) `questionnaire_vax01.pdf`: exported SoSci survey in Serbian (some information redacted for peer-review) `values_vax01_en.csv`: question response labels translated into English `variables_vax01_en.csv`: question text translated into English <br/> 📁**04 Experiment 2** Contains data from the experiment conducted in April-May 2022 (229 responses in the dataset; final sample was *N* = 217 adult participants residing in Serbia). `data_vax02.csv`: original dataset `data_vax02_en.csv`: dataset with some characters replaced in participants' open-ended responses in Serbian (encoding changed from UTF-8 to ANSI) to ease statistical analyses `full-descriptives_code_vax02.html`, `full-descriptives_code_vax02.Rmd`: download and open the HTML file to read the results report without having to run the code; the R Markdown (.Rmd) file contains code to knit the HTML report; reproduces all of the analyses and tables reported in the manuscript, as well as the frequencies of endorsing close-ended reasons for (non-)vaccination *before* collapsing the options `preregistration_for-peer-review_vax02.pdf`: an anonymized copy of an AsPredicted preregistration (for peer-review only) `questionnaire_vax02.pdf`: exported SoSci survey in Serbian (some information redacted for peer-review) `values_vax02_en.csv`: question response labels translated into English `variables_vax02_en.csv`: question text translated into English <br/> 📁**05 Experiment 3** Contains data from the experiment conducted in December 2023 (1,303 responses in the dataset; final sample was *N* = 1,060 adult participants residing in Serbia). `code_vax03.R`: code to reproduce all analyses, tables, and figures in the manuscript `data_vax03.csv`: dataset `preregistration_for-peer-review_vax03.pdf`: an anonymized copy of an AsPredicted preregistration (for peer-review only) `questionnaire_vax03.pdf`: exported SoSci survey in Serbian (some information redacted for peer-review) `socdem_by_condition_vax03.pdf`: a report on age, sex, and general vaccination attitude separately in each experimental condition `values_vax03_en.csv`: question response labels translated into English `variables_vax03_en.csv`: question text translated into English ---------- `package_citations.pdf`: lists R packages used in Experiments 1-3 and their citations