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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
15,075 15,056 26% 39% 17% 15% 691 92% 3% 5% 0%
- Simulation Users 5
61 61 61% 15% 7% 15% 18 72% 22% 6% 0%
- Interactive Users 6
2,782 2,777 41% 30% 18% 12% 249 98% 0% 1% 0%
- Download Users 7
13,475 13,462 26% 39% 16% 15% 291 94% 1% 5% 0%
Table 2: Simulation Usage
Simulation Users 5 61 users
Simulation Runs 2,180 jobs
Total CPU Time 62 days  
Total Wall Time 305 days  
Total Interaction Time 19 days  
Users with > 10 mins of CPU Time 5 users  
Avg. Number of Simulation Runs/User 36 jobs  
Avg. Time between First and Last Simulation 547 days  
Repeat Users with > 10 Simulation Jobs 13 users  
Repeat Users with > 3 Months 9 42 users  
Table 3: Miscellaneous Statistics
Domains Served 4,920
Cumulative Interactive User Sessions 10 6,969
Cumulative Session Time 313 days
Visitors 11 52,440
Visits 12 84,526
New Accounts 177
Max User Logins 114 users on 2015-06-02
Web Server Hits 2,265,517
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
15,075 15,056 26% 39% 17% 15% 691 92% 3% 5% 0%
- Registered Users 2
412 411 63% 16% 7% 11% 53 77% 15% 8% 0%
- Unregistered Interactive Users 3
2,070 2,065 31% 34% 21% 12% 103 96% 3% 1% 0%
- Unregistered Download Users 4
12,593 12,580 24% 40% 16% 15% 535 93% 1% 6% 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.