DOI

Statistical significance testing is widely accepted as a means to assess how well a difference in effectiveness reflects an actual difference between systems, as opposed to random noise because of the selection of topics. According to recent surveys on SIGIR, CIKM, ECIR and TOIS papers, the t-test is the most popular choice among IR researchers. However, previous work has suggested computer intensive tests like the bootstrap or the permutation test, based mainly on theoretical arguments. On empirical grounds, others have suggested non-parametric alternatives such as the Wilcoxon test. Indeed, the question of which tests we should use has accompanied IR and related fields for decades now. Previous theoretical studies on this matter were limited in that we know that test assumptions are not met in IR experiments, and empirical studies were limited in that we do not have the necessary control over the null hypotheses to compute actual Type I and Type II error rates under realistic conditions. Therefore, not only is it unclear which test to use, but also how much trust we should put in them. In contrast to past studies, in this paper we employ a recent simulation methodology from TREC data to go around these limitations. Our study comprises over 500 million p-values computed for a range of tests, systems, effectiveness measures, topic set sizes and effect sizes, and for both the 2-tail and 1-tail cases. Having such a large supply of IR evaluation data with full knowledge of the null hypotheses, we are finally in a position to evaluate how well statistical significance tests really behave with IR data, and make sound recommendations for practitioners.
Original languageEnglish
Title of host publicationSIGIR'19 Proceedings of the 42nd International ACM SIGIR Conference on Research and Development in Information Retrieval
Place of PublicationNew York, USA
PublisherACM DL
Pages505-514
Number of pages10
ISBN (Print)978-1-4503-6172-9
DOIs
Publication statusPublished - 2019
EventSIGIR 2019: the 42nd International ACM SIGIR Conference on Research and Development in Information Retrieval - Cité des Sciences, Paris, France
Duration: 21 Jul 201925 Jul 2019
https://sigir.org/sigir2019/

Conference

ConferenceSIGIR 2019: the 42nd International ACM SIGIR Conference on Research and Development in Information Retrieval
Abbreviated titleSIGIR '19
CountryFrance
CityParis
Period21/07/1925/07/19
Internet address

    Research areas

  • Statistical significance, Student’s t-test, Wilcoxon test, Sign test, Bootstrap, Permutation, Simulation, Type I and Type II errors

ID: 55635612