2.3 Role of Social Network Metrics<br>Social metrics measures are powerful measures with which we are in position to<br>discover hidden relations between nodes. Each network metrics plays specific role<br>in discovering relations, as well as for important nodes recognition. During social<br>network analysis stage, analysts are in position to combine different metrics with<br>intention to reveal hidden knowledge [1, 2, 4]. Usage of social metrics combination<br>is not always an easy task, especially in situation where we would like to create<br>filters for network structure based on social network metrics [14]. Interpretation of<br>such defined social network metrics combination could be hard as well as ensuring<br>periodical analysis on same filters.<br>In conditions where we have social network data; it is valuable source for cognitive<br>computing in light of fraud detection [1–4, 7, 10]. Concentrations of influences<br>within nodes with some detected anomalies can be on help for automated fraud investigation.<br>For example if we have some suspicious activities in multimodal network<br>on node level, where suspicious activities are recognised as frequent events associated<br>with Benford’s law or/and extremes and also high value of social network<br>metrics like eigenvector this nodes are for sure worth of further deeper investigation.<br>Social network analysis can be applied only in situation where we are dealing<br>with social network data, and it contributes to higher accuracy in fraud detection.<br>From that perspective, social network analysis contributes also in synergy of different<br>elementswhich provides solution for complex and challenging problems [11, 12,<br>14–17]. Usage of social network metrics in fraud is well known in practice and literature.<br>From perspective of proposed solution it is useful element which contribute<br>to cognitive fraud detection solution along with Benford’s law, statistical measures,<br>united within fuzzy expert system as holistic system for fraud detection. Generally<br>speaking each social network metrics like degree centrality, betweenes, eigenvector<br>and other measures has great potential as itself in fraud detection. Enumerated<br>metrics by itself can be good milestones for deeper investigation of fraud if we are<br>talking about fraud detection models. As it is case with other mentioned techniques,<br>grounding hypothesis on single, or limited number of techniques or methods are not<br>sufficient, especially if we are dealing with cognitive fraud detection systems.
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