Lifeflow: Visualizing an Overview of Event Sequences
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Lifeflow: Visualizing an Overview of Event Sequences

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Paper presentation at the ACM SIGCHI Conference on Human Factors in Computing Systems (CHI). Vancouver, BC (May 10, 2011) ...

Paper presentation at the ACM SIGCHI Conference on Human Factors in Computing Systems (CHI). Vancouver, BC (May 10, 2011)

More info:
http://www.cs.umd.edu/hcil/lifeflow

Abstract:
Event sequence analysis is an important task in many domains: medical researchers may study the patterns of transfers within the hospital for quality control; transportation experts may study accident response logs to identify best practices. In many cases they deal with thousands of records. While previous research has focused on searching and browsing, overview tasks are often overlooked. We introduce a novel interactive visual overview of event sequences called LifeFlow. LifeFlow is scalable, can summarize all possible sequences, and represents the temporal spacing of the events within sequences. Two case studies with healthcare and transportation domain experts are presented to illustrate the usefulness of LifeFlow. A user study with ten participants confirmed that after 15 minutes of training novice users were
able to rapidly answer questions about the prevalence and temporal characteristics
of sequences, find anomalies, and gain significant insight from the data.

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Lifeflow: Visualizing an Overview of Event Sequences Lifeflow: Visualizing an Overview of Event Sequences Presentation Transcript

  • LifeFlow:Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • event event event event eventevent event event LIFE event event event event event event event event LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Time Event type ( 7:00 am, Wake up ) event event event event eventevent event event LIFE event event event event event event event event LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • event event event event eventevent event event LIFE event event event event event event event event “Event Sequence” LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Human Activities( 7:00 am, Wake up ) ( 7:10 am, Shower ) ( 7:30 am, Breakfast ) LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Traffic Incidents Logs( 9:30 am, Notification ) ( 9:55 am, Units arrived) ( 10:30 am, Scene cleared ) LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Event Sequences Human Activities Electronic Health Records Traffic Incident Logs Usability Study Logs Web logs and more… LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Physicians at Washington Hospital CenterLifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Electronic Health Records•  E.g. patient transfers in the hospital•  Event types: ARRIVAL Arrive the hospital EMERGENCY Emergency room ICU Intensive Care Unit FLOOR Normal room DISCHARGE-ALIVE Leave the hospital alive DIE Leave the hospital dead LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Improve the Quality of Care Patient ID: 45851733 Patient ID: 4585173212/02/2008  14:26  Arrival   Emergency Department12/02/2008  14:26ID:Arrival   12/02/2008  14:26   45851731 Patient  Emergency   6,000+12/02/2008  22:44  ICU  mergency   12/02/2008  14:26  E  12/05/2008  05:071Floor  Arrival   12/02/2008     4:26 12/02/2008  22:44  ICU  mergency   12/02/2008  14:26  E12/08/2008  10:02  Floor   12/05/2008  05:07  Floor   12/02/2008  22:44  ICU  12/14/2008  06:19  Discharge   12/08/2008  10:02  Floor   12/05/2008  05:07  Floor     12/14/2008  06:19  Discharge   12/08/2008  10:02  Floor     12/14/2008  06:19  Discharge   patients per month   LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Visualizing event sequences LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • From one event sequence...•  Single record [Cousins91], [Harrison94], [Plaisant98], … Patient ID: 45851737 12/02/2008  14:26  Arrival   12/02/2008  14:26  Emergency   12/02/2008  22:44  ICU   12/05/2008  05:07  Floor   12/08/2008  10:02  Floor   12/14/2008  06:19  Discharge     Time Patient #45851737 Arrival Emergency Room ICU Floor Discharge compact LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • To multiple event sequences...•  Search [Fails06], [Wang08], [Vrotsou09], … LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • To multiple event sequences...•  Search [Fails06], [Wang08], [Vrotsou09], … LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • To multiple event sequences...•  Search [Fails06], [Wang08], [Vrotsou09], …•  Group [Phan07], [Burch08], [Wang09], … 1 { 2 { LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • To multiple event sequences...•  Search•  Group•  Summarize? LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Summarizee.g. 1) What happened to the patients after they arrived? Arrival ? ? 2) What happened to the patients before & after ICU? ICU ? ? ? ? LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Overview / Summary Millions of records LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Challenges•  Display millions of records on one screen –  Limited space (typical monitors) –  Scalability (millions of records?) –  Aggregation•  While preserve important information –  What are all the possible sequences? –  How long is the gap between each pair of events? LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • LIFEFLOW Picture > 1000 wordsLifeFlow > 1000 event sequences LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • LIFEFLOW … is novel … is scalable … provides the missing overview … summarizes all possible sequences and time gap between eventsLifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • VIDEO esign wD LifeFloLifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • DEMO emonstration wD LifeFloLifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Case Study#1: Medical6,000+ Improve the Quality of Care patients per month Feedback •  Big picture + anomalies •  Less worry about query formulation, more time thinking about new questions •  Long-term monitoring LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Case Study#2: Transportation200,000+ Compare traffic agencies traffic incidents LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • 100 years!
  • Clean the data.LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Video
  • Notification Return to normal Time Agency
  • Case Study#2: Transportation200,000+ Compare traffic agencies traffic incidents Feedback •  Reveal unexpected sequences •  Identify data errors •  Can ask more questions, faster, and richer LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • User Study•  10 participants•  Goals: –  Learnability –  Strategies / Problems•  Procedure: –  12-minute training –  15 tasks•  Results: –  Participants can perform given tasks. LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Quotes “Oh! This is very cool!” “The tool is easy to understand and easy to use.”“Very easy to find common and uncommon sequences” “LifeFlow provides a great summary of the big picture.” “Can I use it with my dataset?” LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Conclusions•  LifeFlow –  Overview –  All sequences + gap between events•  2 case studies + 1 user study –  Show big picture + reveal anomalies –  New questions from the data –  Easy to learn•  Applicable to many domains LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Acknowledgement•  Washington Hospital Center Phuong Ho, Mark Smith, David Roseman http://www.whcenter.org•  National Institutes of Health (NIH) Grant RC1CA147489-02 http://www.nih.gov•  CATT Lab Michael Pack, Michael VanDaniker, Nikola Ivanov http://www.cattlab.umd.edu LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Conclusions•  LifeFlow –  Overview of event sequences –  All sequences + gap between events•  2 case studies + 1 user study –  See big picture + reveal anomalies –  New questions from the data –  Easy to learn•  Applicable to many domains HCIL’s 28th Annual Symposium Contact me May 25-26, 2011 kristw@cs.umd.edu University of Maryland #HCIL www.cs.umd.edu/hcil/lifeflow LifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • Q&Aestion? Any quLifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
  • NK YtOaU welcome. THA mmen s re Your coLifeFlow: Visualizing an Overview of Event Sequences by Krist Wongsuphasawat is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.