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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
118,016 105,078 28% 36% 18% 14% 5,247 94% 3% 3% 0%
- Simulation Users 5
1,649 1,648 58% 15% 14% 12% 130 83% 13% 4% 1%
- Interactive Users 6
18,295 15,855 29% 47% 14% 9% 1,023 97% 0% 3% 0%
- Download Users 7
101,880 91,264 29% 34% 19% 14% 1,076 96% 1% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 1,649 users
Simulation Runs 45,987 jobs
Total CPU Time 817 days  
Total Wall Time 5,009 days  
Total Interaction Time 1,069 days  
Users with > 10 mins of CPU Time 178 users  
Avg. Number of Simulation Runs/User 28 jobs  
Avg. Time between First and Last Simulation 610 days  
Repeat Users with > 10 Simulation Jobs 334 users  
Repeat Users with > 3 Months 9 481 users  
Table 3: Miscellaneous Statistics
Domains Served 15,981
Cumulative Interactive User Sessions 10 85,465
Cumulative Session Time 2,785 days
Visitors 11 364,304
Visits 12 867,553
New Accounts 2,147
Max User Logins 136 users on 2013-10-10
Web Server Hits 29,332,860
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
118,016 105,078 28% 36% 18% 14% 5,247 94% 3% 3% 0%
- Registered Users 2
3,142 3,135 57% 18% 13% 11% 288 78% 14% 5% 2%
- Unregistered Interactive Users 3
15,820 13,453 22% 52% 14% 9% 681 93% 2% 5% 0%
- Unregistered Download Users 4
99,054 88,490 28% 34% 19% 14% 4,278 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.