The study of relationship closeness has a long history in psychology and is currently expanding across the social sciences, including economics. Estimating relationship closeness requires appropriate tools. Here, we introduce and test a tool for estimating relationship closeness: 'IOS'. The IOS scale has an 11-point response scale and is a refinement of the widely used Inclusion-of-Other-in-the-Self scale. Our tool has three key features. First, the IOS scale is easy to understand and administer. Second, we provide a portable, interactive interface for the IOS scale, which can be used in lab and online studies. Third, and crucially, based on within-participant correlations of 751 individuals, we demonstrate strong validity of the IOS scale in terms of representing features of relationships captured by a range of more complex survey instruments. Based on these correlations we find that the IOS scale outperforms the IOS scale and performs as well as the related Oneness scale.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11024120 | PMC |
| http://dx.doi.org/10.1038/s41598-024-58042-6 | DOI Listing |
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