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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
71,186 68,355 29% 33% 20% 13% 3,487 95% 3% 3% 0%
- Simulation Users 5
561 559 57% 15% 12% 14% 57 79% 16% 5% 0%
- Interactive Users 6
12,995 12,406 28% 39% 20% 12% 823 98% 0% 2% 0%
- Download Users 7
60,692 58,391 31% 31% 19% 13% 889 97% 0% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 561 users
Simulation Runs 19,185 jobs
Total CPU Time 201 days  
Total Wall Time 12,420 days  
Total Interaction Time 156 days  
Users with > 10 mins of CPU Time 142 users  
Avg. Number of Simulation Runs/User 34 jobs  
Avg. Time between First and Last Simulation 221 days  
Repeat Users with > 10 Simulation Jobs 120 users  
Repeat Users with > 3 Months 9 195 users  
Table 3: Miscellaneous Statistics
Domains Served 12,530
Cumulative Interactive User Sessions 10 47,909
Cumulative Session Time 1,388 days
Visitors 11 204,978
Visits 12 507,441
New Accounts 612
Max User Logins 116 users on 2014-10-07
Web Server Hits 13,255,695
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
71,186 68,355 29% 33% 20% 13% 3,487 95% 3% 3% 0%
- Registered Users 2
1,283 1,278 62% 17% 10% 10% 155 83% 12% 4% 2%
- Unregistered Interactive Users 3
11,264 10,708 21% 43% 21% 13% 622 95% 2% 3% 0%
- Unregistered Download Users 4
58,639 56,369 30% 32% 19% 13% 2,710 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.