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On Gower Similarity Coefficient and Missing Values

Kryszkiewicz Marzena

Annals of Computer Science and Information Systems

2023

Vol. 35

1035--1040

The Gower similarity coefficient is a popular measure for comparing objects with possibly mixed type attributes and missing values. One of its characteristics is that it calculates the coefficient value without considering attributes with missing values. In this article, we explore the properties of coefficient in detail, including the consequences of omitting attributes with missing values. We also introduce strict lower and upper bounds on the Gower similarity coefficient, derive a number of their properties and propose a solution to the identified problem with the Gower similarity coefficient.