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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
112,699 109,703 28% 37% 18% 13% 5,033 94% 3% 3% 0%
- Simulation Users 5
1,478 1,476 59% 15% 13% 11% 121 83% 13% 3% 1%
- Interactive Users 6
21,856 20,998 28% 48% 14% 8% 1,205 97% 0% 3% 0%
- Download Users 7
93,420 91,205 29% 34% 19% 14% 1,129 96% 1% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,478 users
Simulation Runs 45,528 jobs
Total CPU Time 810 days  
Total Wall Time 5,752 days  
Total Interaction Time 924 days  
Users with > 10 mins of CPU Time 191 users  
Avg. Number of Simulation Runs/User 31 jobs  
Avg. Time between First and Last Simulation 172 days  
Repeat Users with > 10 Simulation Jobs 306 users  
Repeat Users with > 3 Months 9 454 users  
Table 3: Miscellaneous Statistics
Domains Served 18,314
Cumulative Interactive User Sessions 10 100,433
Cumulative Session Time 3,507 days
Visitors 11 398,098
Visits 12 1,122,017
New Accounts 1,946
Max User Logins 131 users on 2014-07-16
Web Server Hits 34,037,175
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
112,699 109,703 28% 37% 18% 13% 5,033 94% 3% 3% 0%
- Registered Users 2
2,987 2,979 59% 18% 11% 11% 278 79% 14% 5% 3%
- Unregistered Interactive Users 3
19,108 18,305 23% 53% 14% 8% 952 94% 1% 4% 0%
- Unregistered Download Users 4
90,604 88,419 28% 34% 19% 14% 3,803 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.