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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
28,843 27,535 34% 31% 18% 12% 1,613 94% 3% 3% 0%
- Simulation Users 5
290 289 61% 11% 11% 14% 35 74% 20% 6% 0%
- Interactive Users 6
4,095 3,832 40% 33% 18% 9% 472 98% 0% 2% 0%
- Download Users 7
26,458 25,353 35% 30% 18% 12% 600 97% 1% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 290 users
Simulation Runs 6,290 jobs
Total CPU Time 93 days  
Total Wall Time 433 days  
Total Interaction Time 59 days  
Users with > 10 mins of CPU Time 45 users  
Avg. Number of Simulation Runs/User 22 jobs  
Avg. Time between First and Last Simulation 218 days  
Repeat Users with > 10 Simulation Jobs 69 users  
Repeat Users with > 3 Months 9 96 users  
Table 3: Miscellaneous Statistics
Domains Served 7,032
Cumulative Interactive User Sessions 10 14,514
Cumulative Session Time 416 days
Visitors 11 84,933
Visits 12 182,731
New Accounts 271
Max User Logins 87 users on 2015-01-12
Web Server Hits 4,465,806
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
28,843 27,535 34% 31% 18% 12% 1,613 94% 3% 3% 0%
- Registered Users 2
658 654 65% 15% 8% 10% 84 81% 13% 5% 1%
- Unregistered Interactive Users 3
3,076 2,846 29% 38% 21% 10% 187 94% 3% 4% 0%
- Unregistered Download Users 4
25,109 24,035 34% 31% 18% 12% 1,342 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.