Exploring universal patterns in human home-work commuting from mobile phone data.

The researchers conceded that there may be significant limitations to their analyses, as their conclusions were borne out of a meta-analysis of diverse commute-related datasets, and as a result, there may very easily be confounding factors–such as survey types/questions [26] , analysis units [27] – [28] , types of trips included [29] – [30] –in how the data are collected/analyzed that would have influenced the observed outcomes.

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