An analytical framework to nowcast well-being using Big Data

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Presentation transcript:

An analytical framework to nowcast well-being using Big Data Luca Pappalardo www.lucapappalardo.com @lucpappalard University of Pisa ISTI-CNR

Why Big Data? The GPS tracks of car travels originating in Pisa (red) vs. the GPS tracks of car travels originating in Florence (green) (viz by KDD LAB)

A support to surveys Surveys don’t scale to fine spatio-temporal resolution Surveys don’t adapt to power law distributions: Impossibility to study wealth distribution with samples 50 guys own the same wealth of 3.5 billion people Millennials do not respond to surveys!

Are human mobility patterns associated to well-being? The purpose of the study I am gonna present you today is to understand the relationships between human mobility and the socio-economic development of a territory. In order to do that we performed a data-driven study in France exploiting the access to mobile phone data provided by the Orange Telecom provider.

The analytical framework

mobile phone data 1G calls 45 days dataset 20M users Out dataset, provided the Orange company, contains information about more than 60 million calls made by 6 million users during a period of observation of 45 days (september-october 2007)

Individual measures Mobility volume: the characteristic distance traveled by individuals Mobility diversity: the predictability of individuals’ movements In the mobility context, we used the radius of gyration as measure of volume, which gives the characteristic traveled distance of a given user, a measure of how far she is from his center of mass. For the diversity measure we used the mobility entropy, that is the equivalent of the social diversity in the mobility context: it tends to one when a user starting from a location can go in many different other locations, while it is zero when a given user, starting from a location, goes always in the same destination. The higher the entropy, the lower the predictability of the user’s mobility.

Low Diversity High Diversity

user/territory mapping home locations are the most frequent towers during nighttime (8 p.m. – 3 a.m.) We assign each individual’s home location to the corresponding municipality Paris

territorial aggregation We aggregate the measures of individuals in the same area by the mean We considered external indexes of economic development (source: INSEE): Deprivation index Per capita income

Mobility diversity vs well-being We investigate the correlations between the aggregated mobility measures and the four external socio-economic indicators. We see from the figures that a clear tendency emerges, in this case for mobility entropy: the higher the mobility entropy the lower the deprivation index.

Predictive models Regression predicting the exact value of well-being R2 = 0.42 (deprivation) R2 = 0.25 (income) Classification: predicting the class of deprivation acc = 0.61 (deprivation) acc = 0.54 (income)

Mobility diversity matters!

International Journal of Data Science and Analytics 2016 The purpose of the study I am gonna present you today is to understand the relationships between human mobility and the socio-economic development of a territory. In order to do that we performed a data-driven study in France exploiting the access to mobile phone data provided by the Orange Telecom provider. International Journal of Data Science and Analytics 2016 https://link.springer.com/article/10.1007/s41060-016-0013-2

SoBigData.eu transnational access SoBigData invites researchers and professionals to apply to participate in Short Term Scientific Missions (STSMs). We welcome applications from individuals with a scientific interest, professionals, startups and innovators that may benefit from training in data science and social media analytics.

Big Data can be a valid support to surveys human mobility patterns are associated to well-being… …especially mobility diversity

Thank you! Luca Pappalardo University of Pisa ISTI-CNR www.lucapappalardo.com www.sobigdata.eu @lucpappalard University of Pisa ISTI-CNR