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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
135,668 131,522 28% 36% 19% 14% 5,928 94% 3% 3% 0%
- Simulation Users 5
1,449 1,447 58% 16% 13% 12% 129 82% 13% 4% 1%
- Interactive Users 6
24,582 23,624 26% 46% 17% 10% 1,197 97% 0% 3% 0%
- Download Users 7
113,892 110,621 29% 33% 19% 14% 1,219 96% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,449 users
Simulation Runs 49,169 jobs
Total CPU Time 926 days  
Total Wall Time 17,146 days  
Total Interaction Time 1,004 days  
Users with > 10 mins of CPU Time 256 users  
Avg. Number of Simulation Runs/User 34 jobs  
Avg. Time between First and Last Simulation 182 days  
Repeat Users with > 10 Simulation Jobs 311 users  
Repeat Users with > 3 Months 9 461 users  
Table 3: Miscellaneous Statistics
Domains Served 19,105
Cumulative Interactive User Sessions 10 102,812
Cumulative Session Time 3,533 days
Visitors 11 418,962
Visits 12 1,161,498
New Accounts 1,932
Max User Logins 131 users on 2014-07-16
Web Server Hits 34,161,234
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
135,668 131,522 28% 36% 19% 14% 5,928 94% 3% 3% 0%
- Registered Users 2
2,914 2,906 58% 18% 11% 11% 279 79% 14% 5% 3%
- Unregistered Interactive Users 3
21,815 20,916 20% 50% 17% 11% 1,013 95% 1% 4% 0%
- Unregistered Download Users 4
110,939 107,700 28% 34% 19% 14% 4,636 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.
  14. Metrics are calculated and updated at the beginning of each month.