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Usage: Overview

Table 1: User statistics
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
143,168 137,593 28% 36% 19% 14% 6,503 94% 3% 3% 0%
- Simulation Users 5
1,407 1,405 58% 16% 12% 12% 119 82% 14% 4% 0%
- Interactive Users 6
23,706 22,579 27% 44% 18% 11% 1,237 96% 0% 3% 0%
- Download Users 7
122,473 117,909 29% 34% 19% 14% 1,301 96% 0% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 1,407 users
Simulation Runs 48,588 jobs
Total CPU Time 794 days  
Total Wall Time 16,619 days  
Total Interaction Time 717 days  
Users with > 10 mins of CPU Time 272 users  
Avg. Number of Simulation Runs/User 35 jobs  
Avg. Time between First and Last Simulation 185 days  
Repeat Users with > 10 Simulation Jobs 303 users  
Repeat Users with > 3 Months 9 435 users  
Table 3: Miscellaneous Statistics
Domains Served 19,847
Cumulative Interactive User Sessions 10 100,905
Cumulative Session Time 3,281 days
Visitors 11 422,608
Visits 12 1,188,284
New Accounts 1,894
Max User Logins 131 users on 2014-07-16
Web Server Hits 32,876,908
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
143,168 137,593 28% 36% 19% 14% 6,503 94% 3% 3% 0%
- Registered Users 2
2,862 2,853 58% 18% 11% 11% 271 80% 13% 4% 2%
- Unregistered Interactive Users 3
20,890 19,838 22% 47% 19% 11% 1,007 95% 1% 4% 0%
- Unregistered Download Users 4
119,416 114,902 28% 34% 19% 14% 5,225 95% 2% 3% 0%

  1. Sum of Registered Users2, Unregistered Interactive Users3 and Unregistered Download Users4
  2. Number of Users that logged in. User registration assigns a unique login to each individual user.
  3. Number of Unregistered Users, identified by unique hosts/IPs, that had an active Session 10 without logging in. Does not include known web bots/crawlers.
  4. Number of Unregistered users, identified by unique hosts/IPs, that had an active session of less than 15 minutes without logging in and downloaded a non-interactive resource such as PDF or podcast. Does not include web bots/crawlers.
  5. Number of Registered Users2 that ran one or more simulation runs.
  6. All Unregistered Users, identified by unique hosts/IPs, that had an active Session 10. Does not include known web bots/crawlers.
  7. All Unregistered users, identified by unique hosts/IPs that downloaded a non-interactive resource such as PDF or podcast. Does not include known web bots/crawlers.
  8. Sum of Simulation Users 5 + Unregistered Interactive Users 3 including web bots/crawlers.
  9. Number of Simulation users that returned after a gap of 3 months.
  10. Begins when an IP is active on the site for at least 15 minutes. Ends when inactive for more than 30 minutes, including time spent viewing videos.
  11. Identified by a unique IP address / hostname.
  12. Based on MIT OCW metric of Visits: A visit is activity by a unique visitor delimitated by a 30 minute absence from the site on either side of the activity.
    These visits correspond to unique visitors 11. Does not include known web bots/crawlers
  13. Number of Simulation sessions that were shared between 2 or more users.
  14. Metrics are calculated and updated at the beginning of each month.