These data files correspond to the experiments reported in Section 4 of the following paper: A. Kwanashie and D.F. Manlove, An Integer Programming Approach to the Hospitals/Residents Problem with Ties, In Proceedings of OR 2013: the International Conference on Operations Research, pages 263-269, Springer, 2014. Publisher final version: http://dx.doi.org/10.1007/978-3-319-07001-8_36 Author final version: http://eprints.gla.ac.uk/97928 The data in subfolder exp1 corresponds to the instances, matchings and results summaries for the first experiment in Section 4 (Figures 1 and 2). The data in subfolder exp2 corresponds to the instances, matchings and results summaries for the second experiment in Section 4 (Figure 3). Each instance file is in the following format: Each resident preference list is of the following format: : <1st-choice hospital ID> <2nd-choice hospital ID> ... Each hospital preference list is in the following format: : : <1st-choice resident ID> <2nd-choice resident ID> ... In a given hospital's preference lists, ties are indicated by round brackets. Each instance file name is in the following format: model__size__td__instance_.model Each results file name is in the following format: model_results__size__td__instance_.model Note that due to data protection legislation, data from the Scottish Foundation Allocation Scheme, which was used to produce the results shown in Table 1, cannot be made publicly available.