Discussion on the paper “Analysis of spatio-temporal mobile phone data: a case study in the metropolitan area of Milan” by P. Secchi, S. Vantini and V. Vitelli
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First of all, we would like to congratulate the authors for their interesting paper, a nice combination of methodological proposal and data analysis. This work is focused on geo-referenced high-dimensional data, with the purpose of identifying spatial and/or temporal patterns. After a first reading, one may think about possible applications of the proposed methodology in environmental sciences (e.g. pollutants concretation patterns), which certainly opens a fruitful application field. In this area, prediction surfaces can be produced by kriging methods adapted to functional data (see , for an application to temperature curves). Although prediction is usually the main goal, the identification of similar spatial and/or temporal patterns provides useful information for characterizing and understanding the behaviour of the (complex) underlying process, as it can be clearly seen in the example analyzed in this work.
We would like also to highlight the (purley nonparametric)...
KeywordsTemporal Pattern Time Interaction Local Representative Aggregation Step Project Proposal