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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
101,527 98,179 28% 37% 18% 13% 4,548 94% 3% 3% 0%
- Simulation Users 5
1,312 1,310 59% 16% 12% 11% 116 82% 14% 3% 1%
- Interactive Users 6
18,514 17,189 30% 47% 14% 9% 1,122 97% 0% 3% 0%
- Download Users 7
85,586 83,476 30% 34% 18% 14% 1,094 96% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,312 users
Simulation Runs 38,621 jobs
Total CPU Time 778 days  
Total Wall Time 4,364 days  
Total Interaction Time 864 days  
Users with > 10 mins of CPU Time 177 users  
Avg. Number of Simulation Runs/User 29 jobs  
Avg. Time between First and Last Simulation 178 days  
Repeat Users with > 10 Simulation Jobs 277 users  
Repeat Users with > 3 Months 9 415 users  
Table 3: Miscellaneous Statistics
Domains Served 16,420
Cumulative Interactive User Sessions 10 83,363
Cumulative Session Time 2,962 days
Visitors 11 341,235
Visits 12 955,289
New Accounts 1,722
Max User Logins 131 users on 2014-07-16
Web Server Hits 28,432,840
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
101,527 98,179 28% 37% 18% 13% 4,548 94% 3% 3% 0%
- Registered Users 2
2,657 2,648 59% 18% 11% 11% 255 78% 14% 5% 3%
- Unregistered Interactive Users 3
15,957 14,700 23% 52% 15% 9% 796 94% 1% 5% 0%
- Unregistered Download Users 4
82,913 80,831 28% 35% 18% 14% 3,497 95% 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.