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You are here: Home » Usage » Overview » By Fiscal Year

Usage: Overview

Table 1: User statistics
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
146,143 130,398 29% 34% 18% 15% 6,388 94% 2% 3% 0%
- Simulation Users 5
1,018 1,017 55% 16% 12% 14% 91 80% 15% 4% 0%
- Interactive Users 6
21,628 19,808 28% 40% 19% 12% 983 97% 0% 2% 0%
- Download Users 7
127,766 113,914 30% 33% 18% 15% 1,186 97% 0% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 1,018 users
Simulation Runs 40,525 jobs
Total CPU Time 1,067 days  
Total Wall Time 21,896 days  
Total Interaction Time 417 days  
Users with > 10 mins of CPU Time 269 users  
Avg. Number of Simulation Runs/User 40 jobs  
Avg. Time between First and Last Simulation 212 days  
Repeat Users with > 10 Simulation Jobs 236 users  
Repeat Users with > 3 Months 9 336 users  
Table 3: Miscellaneous Statistics
Domains Served 19,452
Cumulative Interactive User Sessions 10 80,885
Cumulative Session Time 2,477 days
Visitors 11 420,592
Visits 12 966,095
New Accounts 1,181
Max User Logins 116 users on 2014-10-07
Web Server Hits 25,902,365
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
146,143 130,398 29% 34% 18% 15% 6,388 94% 2% 3% 0%
- Registered Users 2
2,269 2,060 56% 19% 11% 12% 207 84% 12% 3% 1%
- Unregistered Interactive Users 3
19,061 17,313 23% 42% 20% 13% 938 95% 2% 3% 0%
- Unregistered Download Users 4
124,813 111,025 29% 33% 18% 15% 5,243 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.