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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
19,263 18,458 23% 35% 24% 16% 756 93% 3% 4% 0%
- Simulation Users 5
123 123 54% 19% 15% 9% 20 65% 30% 5% 0%
- Interactive Users 6
5,225 5,031 23% 32% 26% 18% 481 99% 0% 1% 0%
- Download Users 7
15,298 14,670 27% 34% 22% 14% 403 96% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 123 users
Simulation Runs 5,772 jobs
Total CPU Time 3 days  
Total Wall Time 2,129 days  
Total Interaction Time 14 days  
Users with > 10 mins of CPU Time 44 users  
Avg. Number of Simulation Runs/User 47 jobs  
Avg. Time between First and Last Simulation 331 days  
Repeat Users with > 10 Simulation Jobs 25 users  
Repeat Users with > 3 Months 9 65 users  
Table 3: Miscellaneous Statistics
Domains Served 4,953
Cumulative Interactive User Sessions 10 8,952
Cumulative Session Time 263 days
Visitors 11 57,128
Visits 12 103,985
New Accounts 116
Max User Logins 108 users on 2014-12-08
Web Server Hits 2,409,831
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
19,263 18,458 23% 35% 24% 16% 756 93% 3% 4% 0%
- Registered Users 2
453 451 68% 13% 8% 9% 67 84% 13% 3% 0%
- Unregistered Interactive Users 3
4,377 4,190 13% 36% 30% 20% 150 95% 2% 3% 0%
- Unregistered Download Users 4
14,433 13,817 24% 35% 22% 15% 539 94% 2% 4% 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.