Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Can Single Solution Optimisation Methods Be Structurally Biased?

Version 1 : Received: 18 February 2020 / Approved: 19 February 2020 / Online: 19 February 2020 (11:37:08 CET)

How to cite: Kononova, A.V.; Caraffini, F.; Wang, H.; Bäck, T. Can Single Solution Optimisation Methods Be Structurally Biased?. Preprints 2020, 2020020277 (doi: 10.20944/preprints202002.0277.v1). Kononova, A.V.; Caraffini, F.; Wang, H.; Bäck, T. Can Single Solution Optimisation Methods Be Structurally Biased?. Preprints 2020, 2020020277 (doi: 10.20944/preprints202002.0277.v1).

Abstract

This paper investigates whether optimisation methods with the population made up of one solution can suffer from structural bias just like their multisolution variants. Following recent results highlighting the importance of choice of strategy for handling solutions generated outside the domain, a selection of single solution methods are considered in conjunction with several such strategies. Obtained results are tested for the presence of structural bias by means of a traditional approach from literature and a newly proposed here statistical approach. These two tests are demonstrated to be not fully consistent. All tested methods are found to be structurally biased with at least one of the tested strategies. Confirming results for multisolution methods, it is such strategy that is shown to control the emergence of structural bias in single solution methods. Some of the tested methods exhibit a kind of structural bias that has not been observed before.

Supplementary and Associated Material

http://www.doi.org/10.17632/zdh2phb3b4.2: Extended results and source images
http://www.doi.org/10.5281/zenodo.3237023: Source code (SOS software platform)

Subject Areas

structural bias; algorithmic design; hypothesis testing; single solution methods; constraint handling

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