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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
45,401 43,632 27% 35% 20% 14% 2,137 95% 2% 2% 0%
- Simulation Users 5
335 333 53% 19% 13% 13% 44 82% 16% 2% 0%
- Interactive Users 6
9,924 9,530 27% 39% 20% 13% 683 99% 0% 1% 0%
- Download Users 7
37,541 36,131 30% 32% 20% 14% 683 97% 0% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 335 users
Simulation Runs 12,895 jobs
Total CPU Time 109 days  
Total Wall Time 11,987 days  
Total Interaction Time 96 days  
Users with > 10 mins of CPU Time 113 users  
Avg. Number of Simulation Runs/User 38 jobs  
Avg. Time between First and Last Simulation 260 days  
Repeat Users with > 10 Simulation Jobs 65 users  
Repeat Users with > 3 Months 9 143 users  
Table 3: Miscellaneous Statistics
Domains Served 9,273
Cumulative Interactive User Sessions 10 33,395
Cumulative Session Time 973 days
Visitors 11 133,632
Visits 12 324,706
New Accounts 341
Max User Logins 116 users on 2014-10-07
Web Server Hits 8,688,063
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
45,401 43,632 27% 35% 20% 14% 2,137 95% 2% 2% 0%
- Registered Users 2
897 894 63% 16% 10% 10% 122 85% 11% 2% 2%
- Unregistered Interactive Users 3
8,543 8,168 20% 44% 22% 14% 461 96% 2% 2% 0%
- Unregistered Download Users 4
35,961 34,570 28% 33% 20% 14% 1,554 96% 2% 2% 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.