The likelihood-ratio test for multi-edge network models
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Date
2021-09
Publication Type
Journal Article
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Abstract
The complexity underlying real-world systems implies that standard statistical hypothesis testing methods may not be adequate for these peculiar applications. Specifically, we show that the likelihood-ratio (LR) test's null-distribution needs to be modified to accommodate the complexity found in multi-edge network data. When working with independent observations, the p-values of LR tests are approximated using a χ2 distribution. However, such an approximation should not be used when dealing with multi-edge network data. This type of data is characterized by multiple correlations and competitions that make the standard approximation unsuitable. We provide a solution to the problem by providing a better approximation of the LR test null-distribution through a beta distribution. Finally, we empirically show that even for a small multi-edge network, the standard χ2 approximation provides erroneous results, while the proposed beta approximation yields the correct p-value estimation.
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published
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Volume
2 (3)
Pages / Article No.
35012
Publisher
IOP Publishing
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Software
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Subject
likelihood-ratio test; multi-edge network; complex system; hypothesis testing; model selection
Organisational unit
03682 - Schweitzer, Frank (emeritus) / Schweitzer, Frank (emeritus)
03682 - Schweitzer, Frank (emeritus) / Schweitzer, Frank (emeritus)