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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
126,752 123,847 27% 37% 18% 13% 5,848 94% 3% 3% 0%
- Simulation Users 5
1,673 1,672 59% 15% 13% 12% 131 83% 13% 4% 1%
- Interactive Users 6
20,193 19,479 29% 47% 14% 9% 1,194 96% 0% 3% 0%
- Download Users 7
109,236 106,969 28% 35% 19% 14% 1,201 96% 1% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,673 users
Simulation Runs 46,745 jobs
Total CPU Time 865 days  
Total Wall Time 4,703 days  
Total Interaction Time 986 days  
Users with > 10 mins of CPU Time 184 users  
Avg. Number of Simulation Runs/User 28 jobs  
Avg. Time between First and Last Simulation 162 days  
Repeat Users with > 10 Simulation Jobs 335 users  
Repeat Users with > 3 Months 9 485 users  
Table 3: Miscellaneous Statistics
Domains Served 17,715
Cumulative Interactive User Sessions 10 88,766
Cumulative Session Time 3,290 days
Visitors 11 387,942
Visits 12 1,023,711
New Accounts 2,169
Max User Logins 136 users on 2013-10-10
Web Server Hits 32,942,363
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
126,752 123,847 27% 37% 18% 13% 5,848 94% 3% 3% 0%
- Registered Users 2
3,193 3,186 58% 17% 12% 11% 289 78% 14% 5% 3%
- Unregistered Interactive Users 3
17,342 16,681 22% 51% 15% 9% 820 93% 1% 5% 0%
- Unregistered Download Users 4
106,217 103,980 27% 36% 19% 14% 4,739 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.