on using existing time-use study data for ubiquitous computing applications ubicomp ’08 kurt...
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On Using Existing Time-Use Study Data for Ubiquitous Computing Ap-plications
UbiComp ’08Kurt Partridge and Philippe Golle
Palo Alto Research Center
SangJeong
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Time-Use Studies
• American Time-Use Survey (ATUS)▫USA, Bureau of Labor Statistics▫ To estimate work not included in economics measures
(e.g., home childcare)• Many versions▫ Korean 1999▫ Japanese over 200,000▫American Heritage Time Use Study (AHTUS)
ATUS + 4 older studies▫Harmonized European Time Use Study (HETUS)▫Multinational Time Use Study (MTUS)▫www.timeuse.org
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Excerpt of Time-Use Data
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Activity by Time of Day
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ATUS Activity Classification
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Suitability of Time-Use Data for Ubi-comp• Duration difference▫ A couple hours vs. an instant to tens of minutes▫ “eating breakfast” vs. “scooping granola, pouring milk, lifting
spoon, …”▫ Cannot predict activities at detail, but can bias predictions to-
ward more likely activities
• Domain specificity difference▫ All activities in an entire day vs. a limited domain (physical mo-
tion, in-home activities of daily living, mechanical repair)▫ Can benefit from cross-domain inferences
• Cognitive interpretation difference▫ Participant and interviewer vs. sensor▫ Can collect data of privacy-sensitive activities, e.g. bathroom
use
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Inferring Activity from Context
Using maximum likelihood classifier / tenfold cross-validation
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Activity Inference Accuracy, by Location
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Further Research Questions
• How much do time-use activity and location tax-onomies vary?
• What issues arise when adopting an activity tax-onomy for a ubicomp application?
• What methodologies used by time-use studies can be adopted in ubicomp systems?
• How can ubicomp contribute to time-use study re-search?