Hakuna my data: R codes and data accompanying the paper "Understanding the reliability of citizen science observational data using item response models". Ecology and Evolution. Authors: Edgar Santos-Fernandez, PhD. School of Mathematical Sciences. Y Block, Floor 8, Gardens Point Campus Queensland University of Technology. GPO Box 2434. Brisbane, QLD 4001. Australia edgar.santosfdez@gmail.com Kerrie Mengersen, Dist. Professor of Statistics. Deputy Director, ARC Centre for Mathematical and Statistical Frontiers; Director, QUT Centre for Data Science. School of Mathematical Sciences. Y Block, Floor 8, Gardens Point Campus. Queensland University of Technology. GPO Box 2434. Brisbane, QLD 4001. Australia The paper can be found at: https://arxiv.org/abs/2003.06966 https://www.researchgate.net/publication/339944525_Bayesian_item_response_models_for_citizen_science_ecological_data The models introduced in the article are part of the R package staircase (https://github.com/EdgarSantos-Fernandez/staircase). Content: There are two RMarkdown files: simple_example: shows the fit of a spatial item response model using a small dataset (for illustration purposes only and these results do not appear in the paper). There is a HTML and a PDF version. Item_response_modeling_for_big_data: contains the codes used to fit the models using big datasets on a High-Performance Computing system (Paper section 4.3). There is a HTML output from this file. How to cite: Santos-Fernandez, Edgar, and Mengersen, Kerrie. "Understanding the reliability of citizen science observational data using item response models". Methods in Ecology and Evolution. Santos-Fernandez, Edgar, and Mengersen, Kerrie. "Bayesian item response models for citizen science ecological data." arXiv preprint arXiv:2003.06966 (2020).