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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
58,520 55,829 33% 32% 18% 13% 3,201 94% 3% 3% 0%
- Simulation Users 5
576 575 62% 12% 13% 11% 49 78% 18% 4% 0%
- Interactive Users 6
7,301 6,882 34% 38% 17% 9% 561 98% 1% 2% 0%
- Download Users 7
53,430 51,090 34% 31% 17% 13% 847 97% 0% 2% 0%
Table 2: Simulation Usage
Simulation Users 5 576 users
Simulation Runs 13,843 jobs
Total CPU Time 628 days  
Total Wall Time 8,223 days  
Total Interaction Time 129 days  
Users with > 10 mins of CPU Time 130 users  
Avg. Number of Simulation Runs/User 24 jobs  
Avg. Time between First and Last Simulation 187 days  
Repeat Users with > 10 Simulation Jobs 119 users  
Repeat Users with > 3 Months 9 168 users  
Table 3: Miscellaneous Statistics
Domains Served 10,792
Cumulative Interactive User Sessions 10 26,899
Cumulative Session Time 788 days
Visitors 11 162,607
Visits 12 359,814
New Accounts 601
Max User Logins 87 users on 2015-01-12
Web Server Hits 8,652,866
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
58,520 55,829 33% 32% 18% 13% 3,201 94% 3% 3% 0%
- Registered Users 2
1,133 1,128 61% 17% 10% 10% 113 81% 14% 4% 1%
- Unregistered Interactive Users 3
5,899 5,516 26% 43% 18% 10% 324 93% 2% 4% 0%
- Unregistered Download Users 4
51,488 49,185 33% 31% 18% 13% 2,764 94% 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.