Is it necessary to apply the outlier detection for protein-protein interaction data?

2018-01-01
Ayyıldız, Ezgi
Purutçuoğlu Gazi, Vilda
Objective: Outlier detection is a crucial problem in many fields. Although there are too many outlier detection methods in the literature, only a few methods suitable for dependent, sparse and high dimensional data structure. In this study, we perform various univariate and multivariate outlier detection methods as a pre-processing step before modeling the protein-protein interaction networks in order to investigate whether the outlier detection can improve the accuracy of the model. Material and Methods: Within the univariate approaches, we implement the z-score and Box-plot methods which are the most well-known outlier detection approaches. Besides them, we also apply the multivariate outlier detection methods, called PCOut and Sign which are based on the robust principal component analysis and the BACON method which is a distance-based approach. These methods are applicable for the data type such that the number of variables are bigger than the observation. In the analysis, we use several synthetic and real benchmark biological datasets. Then, we infer the networks with 3 network models, namely, GGM, MARS and CMARS and finally, we check the validity of models via F-measure and the accuracy measures. Conclusion: From the results, it has been seen that the use of outlier detection methods before the modeling cannot contribute to the performance of the models in our datasets. Results: Based on the results obtained from different datasets, we suggest that the estimations of protein-protein interaction networks can be made with GGM, MARS and CMARS methods without the need for an outlier detection process.
Journal of Biostatistics-Turkish Clinics

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Citation Formats
E. Ayyıldız and V. Purutçuoğlu Gazi, “Is it necessary to apply the outlier detection for protein-protein interaction data?,” Journal of Biostatistics-Turkish Clinics, pp. 173–186, 2018, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/73831.