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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
8,787 5,282 22% 52% 12% 11% 136 87% 10% 3% 1%
- Simulation Users 5
142 123 63% 11% 11% 12% 25 80% 20% 0% 0%
- Interactive Users 6
2,346 1,342 20% 67% 8% 3% 42 100% 0% 0% 0%
- Download Users 7
6,480 3,917 23% 48% 13% 13% 56 95% 0% 5% 0%
Table 2: Simulation Usage
Simulation Users 5 142 users
Simulation Runs 2,587 jobs
Total CPU Time 79 days  
Total Wall Time 319 days  
Total Interaction Time 32 days  
Users with > 10 mins of CPU Time 38 users  
Avg. Number of Simulation Runs/User 18 jobs  
Avg. Time between First and Last Simulation 266 days  
Repeat Users with > 10 Simulation Jobs 29 users  
Repeat Users with > 3 Months 9 63 users  
Table 3: Miscellaneous Statistics
Domains Served 1,414
Cumulative Interactive User Sessions 10 12,566
Cumulative Session Time 318 days
Visitors 11 27,035
Visits 12 116,062
New Accounts 205
Max User Logins 131 users on 2014-07-16
Web Server Hits 3,015,155
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
8,787 5,282 22% 52% 12% 11% 136 87% 10% 3% 1%
- Registered Users 2
568 566 68% 11% 7% 12% 92 84% 12% 3% 1%
- Unregistered Interactive Users 3
2,107 1,144 10% 77% 9% 3% 16 100% 0% 0% 0%
- Unregistered Download Users 4
6,112 3,572 19% 51% 14% 13% 28 89% 7% 4% 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.