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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
59,677 48,113 32% 32% 17% 14% 2,787 93% 3% 4% 0%
- Simulation Users 5
955 953 60% 15% 13% 10% 98 83% 13% 3% 1%
- Interactive Users 6
9,391 8,113 32% 45% 13% 8% 639 96% 0% 4% 0%
- Download Users 7
51,919 41,554 34% 29% 17% 14% 790 96% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 955 users
Simulation Runs 26,735 jobs
Total CPU Time 495 days  
Total Wall Time 2,896 days  
Total Interaction Time 715 days  
Users with > 10 mins of CPU Time 123 users  
Avg. Number of Simulation Runs/User 28 jobs  
Avg. Time between First and Last Simulation 183 days  
Repeat Users with > 10 Simulation Jobs 221 users  
Repeat Users with > 3 Months 9 307 users  
Table 3: Miscellaneous Statistics
Domains Served 10,690
Cumulative Interactive User Sessions 10 36,052
Cumulative Session Time 1,143 days
Visitors 11 197,942
Visits 12 404,889
New Accounts 1,050
Max User Logins 115 users on 2014-06-19
Web Server Hits 13,399,217
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
59,677 48,113 32% 32% 17% 14% 2,787 93% 3% 4% 0%
- Registered Users 2
1,807 1,801 60% 18% 12% 9% 196 80% 14% 5% 2%
- Unregistered Interactive Users 3
7,907 6,666 23% 52% 14% 9% 336 91% 1% 7% 0%
- Unregistered Download Users 4
49,963 39,646 32% 30% 18% 15% 2,255 94% 3% 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.