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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
11,673 5,062 29% 29% 16% 24% 563 91% 4% 5% 0%
- Simulation Users 5
93 93 69% 12% 6% 11% 18 72% 22% 6% 0%
- Interactive Users 6
1,750 1,022 53% 22% 13% 13% 219 99% 0% 1% 0%
- Download Users 7
11,225 5,024 32% 27% 15% 23% 363 95% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 93 users
Simulation Runs 2,810 jobs
Total CPU Time 79 days  
Total Wall Time 648 days  
Total Interaction Time 41 days  
Users with > 10 mins of CPU Time 28 users  
Avg. Number of Simulation Runs/User 30 jobs  
Avg. Time between First and Last Simulation 376 days  
Repeat Users with > 10 Simulation Jobs 29 users  
Repeat Users with > 3 Months 9 49 users  
Table 3: Miscellaneous Statistics
Domains Served 3,728
Cumulative Interactive User Sessions 10 4,400
Cumulative Session Time 127 days
Visitors 11 35,895
Visits 12 58,323
New Accounts 80
Max User Logins 60 users on 2015-07-13
Web Server Hits 1,919,023
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
11,673 5,062 29% 29% 16% 24% 563 91% 4% 5% 0%
- Registered Users 2
293 292 67% 19% 5% 8% 39 85% 10% 5% 0%
- Unregistered Interactive Users 3
1,110 487 25% 34% 19% 19% 58 88% 9% 3% 0%
- Unregistered Download Users 4
10,270 4,283 27% 30% 16% 25% 466 92% 3% 5% 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.