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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
103,506 100,651 28% 37% 17% 13% 4,679 94% 3% 3% 0%
- Simulation Users 5
1,355 1,353 59% 16% 12% 11% 118 82% 14% 3% 1%
- Interactive Users 6
20,511 19,690 29% 48% 14% 8% 1,174 97% 0% 3% 0%
- Download Users 7
85,593 83,482 30% 34% 18% 14% 1,103 96% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,355 users
Simulation Runs 42,879 jobs
Total CPU Time 805 days  
Total Wall Time 5,590 days  
Total Interaction Time 898 days  
Users with > 10 mins of CPU Time 187 users  
Avg. Number of Simulation Runs/User 32 jobs  
Avg. Time between First and Last Simulation 176 days  
Repeat Users with > 10 Simulation Jobs 291 users  
Repeat Users with > 3 Months 9 430 users  
Table 3: Miscellaneous Statistics
Domains Served 17,593
Cumulative Interactive User Sessions 10 93,860
Cumulative Session Time 3,270 days
Visitors 11 374,128
Visits 12 1,057,508
New Accounts 1,816
Max User Logins 131 users on 2014-07-16
Web Server Hits 31,662,941
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
103,506 100,651 28% 37% 17% 13% 4,679 94% 3% 3% 0%
- Registered Users 2
2,769 2,761 59% 18% 11% 11% 266 79% 14% 5% 3%
- Unregistered Interactive Users 3
17,853 17,087 23% 53% 14% 8% 921 94% 1% 4% 0%
- Unregistered Download Users 4
82,884 80,803 28% 35% 18% 14% 3,492 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.