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Complex Daily Activities, Country-Level Diversity, and Smartphone Sensing: A Study in Denmark, Italy, Mongolia, Paraguay, and UK

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Published:19 April 2023Publication History

ABSTRACT

Smartphones enable understanding human behavior with activity recognition to support people’s daily lives. Prior studies focused on using inertial sensors to detect simple activities (sitting, walking, running, etc.) and were mostly conducted in homogeneous populations within a country. However, people are more sedentary in the post-pandemic world with the prevalence of remote/hybrid work/study settings, making detecting simple activities less meaningful for context-aware applications. Hence, the understanding of (i) how multimodal smartphone sensors and machine learning models could be used to detect complex daily activities that can better inform about people’s daily lives, and (ii) how models generalize to unseen countries, is limited. We analyzed in-the-wild smartphone data and ∼ 216K self-reports from 637 college students in five countries (Italy, Mongolia, UK, Denmark, Paraguay). Then, we defined a 12-class complex daily activity recognition task and evaluated the performance with different approaches. We found that even though the generic multi-country approach provided an AUROC of 0.70, the country-specific approach performed better with AUROC scores in [0.79-0.89]. We believe that research along the lines of diversity awareness is fundamental for advancing human behavior understanding through smartphones and machine learning, for more real-world utility across countries.

Footnotes

  1. 1 While we acknowledge that cultures can be multidimensional and exist in tension with each other and in plurality within the same country [131], some prior studies in mobile sensing, psychology, and sociology have used “culture” as a proxy to refer to the country of data collection [47, 52, 89, 118]. However, in this study, for consistency, we use “country” (a more specific geographic region) as the unit of analysis that could affect phone usage behavior and sensing data. We also used the term “geographic” rarely, when appropriate and when referring to regions (i.e., Europe).

    Footnote
  2. 2 The dataset is planned to be released for research purposes after the end of the project, by complying with all regulations governing the data collection protocol within and outside the European Union. Hence, future plans for dataset access will be made available on the project website: https://www.internetofus.eu/

    Footnote
  3. 3 We conducted experiments with different time windows between 5 minutes and 25 minutes. We did not go beyond 25 minutes because it would lead to overlapping sensor data segments, hence leaking data between data points. 20-minute window performed the best out of the examined time windows. For brevity, we only present results with the 20-minute window. Shorter windows might not have performed reasonably because they do not capture enough contextual information to make the inference. Prior work too has shown that large time windows might be suitable to detect binary activities [6, 9, 71]

    Footnote
  4. 4 We also tried mean imputation, user-based mean imputation, most frequent value imputation, last observation carried forward (LOCF) imputation, in addition to kNN. However, we obtained the best results for inferences with kNN. In addition, using kNN is common in studies that used passive sensing [94, 129, 132, 136]. Hence, we only reported results obtained with kNN.

    Footnote
  5. 5 We initially tried out other model types such as Gradient Boosting and XGBoost in addition to the reported models. Results for these models were not reported considering their performance and page limits. All these model types are commonly used in small mobile sensing datasets that are in tabular format [9, 74, 77]

    Footnote
  6. 6 https://huyenchip.com/2022/02/07/data-distribution-shifts-and-monitoring.html#data-shifts

    Footnote
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  1. Complex Daily Activities, Country-Level Diversity, and Smartphone Sensing: A Study in Denmark, Italy, Mongolia, Paraguay, and UK

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