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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
145,151 139,468 28% 36% 19% 14% 6,624 94% 3% 3% 0%
- Simulation Users 5
1,326 1,324 56% 16% 13% 13% 111 80% 16% 4% 0%
- Interactive Users 6
23,569 22,471 26% 44% 18% 11% 1,195 96% 0% 3% 0%
- Download Users 7
124,674 119,984 29% 34% 19% 14% 1,310 96% 0% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 1,326 users
Simulation Runs 48,864 jobs
Total CPU Time 1,281 days  
Total Wall Time 23,281 days  
Total Interaction Time 606 days  
Users with > 10 mins of CPU Time 290 users  
Avg. Number of Simulation Runs/User 37 jobs  
Avg. Time between First and Last Simulation 190 days  
Repeat Users with > 10 Simulation Jobs 263 users  
Repeat Users with > 3 Months 9 413 users  
Table 3: Miscellaneous Statistics
Domains Served 19,919
Cumulative Interactive User Sessions 10 101,617
Cumulative Session Time 3,227 days
Visitors 11 422,005
Visits 12 1,186,701
New Accounts 1,792
Max User Logins 131 users on 2014-07-16
Web Server Hits 31,955,128
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
145,151 139,468 28% 36% 19% 14% 6,624 94% 3% 3% 0%
- Registered Users 2
2,704 2,697 58% 18% 11% 11% 256 81% 13% 4% 2%
- Unregistered Interactive Users 3
20,810 19,779 21% 47% 19% 11% 1,021 95% 2% 4% 0%
- Unregistered Download Users 4
121,637 116,992 28% 34% 19% 14% 5,347 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.