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Pré-Publication, Document De Travail (Preprint/Prepublication) Année : 2018

Clustering transformed compositional data using K-means, with applications in gene expression and bicycle sharing system data

Résumé

Although there is no shortage of clustering algorithms proposed in the literature, the question of the most relevant strategy for clustering composi- tional data (i.e., data made up of profiles, whose rows belong to the simplex) re- mains largely unexplored in cases where the observed value of an observation is equal or close to zero for one or more samples. This work is motivated by the analysis of two sets of compositional data, both focused on the categorization of profiles but arising from considerably different applications: (1) identifying groups of co-expressed genes from high-throughput RNA sequencing data, in which a given gene may be completely silent in one or more experimental con- ditions; and (2) finding patterns in the usage of stations over the course of one week in the Velib’ bicycle sharing system in Paris, France. For both of these ap- plications, we focus on the use of appropriately chosen data transformations, including the Centered Log Ratio and a novel extension we propose called the Log Centered Log Ratio, in conjunction with the K -means algorithm. We use a nonasymptotic penalized criterion, whose penalty is calibrated with the slope heuristics, to select the number of clusters present in the data. Finally, we illus- trate the performance of this clustering strategy, which is implemented in the Bioconductor package coseq , on both the gene expression and bicycle sharing system data.
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hal-02789763 , version 1 (05-06-2020)

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  • HAL Id : hal-02789763 , version 1
  • PRODINRA : 421247

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Antoine Godichon-Baggioni, Cathy Maugis-Rabusseau, Andrea Rau. Clustering transformed compositional data using K-means, with applications in gene expression and bicycle sharing system data. 2018. ⟨hal-02789763⟩
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