This dataset is contains the central data used in the Development Policy Centre discussion paper: "Why do so many MPs lose their seats in PNG?" by, Colin Filer, Terence Wood and Henry Ivarature https://devpolicy.crawford.anu.edu.au/publications/discussion-papers The data are online at the following DOI: 10.6084/m9.figshare.16689562 MP data were gathered by Henry Ivarature and Colin Filer. Electoral results data were gathered by Terence Wood and Colin Filer. We are very grateful to everyone who assisted with source data. If you have questions about the data, feel free to email terence.wood@anu.edu.au in the first instance. If you would like the same dataset in Stata please also email Terence. The spreadsheet containing the data contains 3 sheets. The first sheet, 'about' provides the same information that is in this textfile. The next sheet, 'variable descriptions', details the variables made available in the data file. The final sheet, 'data', provides the data.