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The increasing attraction of mobile apps has inspired researchers to analyze apps from different perspectives. As with any software product, apps have different attributes such as size, content maturity, rating, category, or number of downloads. Current research studies mostly consider sampling across all apps. This often results in comparisons of apps being quite different in nature and category (games compared with weather and calendar apps), also being different in size and complexity. Similar to proprietary software and web-based services, more specific results can be expected from looking at more homogeneous samples as they can be received as a result of applying clustering. In this paper, we target homogeneous samples of apps to increase the degree of insight gained from analytics. As a proof-of-concept, we applied the clustering technique DBSCAN and subsequent correlation analysis between app attributes for a set of 940 open-source mobile apps from F-Droid. We showed that (i) clusters of apps with similar characteristics provided more insight compared to applying the same to the whole data and (ii) defining the similarity of apps based on the similarity of topics as created from the topic modeling technique Latent Dirichlet Allocation does not significantly improve clustering results.
Nayebi et al. (Fri,) studied this question.