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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
99,573 87,680 28% 36% 18% 13% 4,548 94% 3% 3% 0%
- Simulation Users 5
1,462 1,452 58% 14% 14% 12% 124 83% 13% 4% 1%
- Interactive Users 6
15,624 13,642 29% 47% 13% 9% 911 96% 0% 3% 0%
- Download Users 7
85,951 75,941 30% 33% 19% 14% 983 96% 1% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,462 users
Simulation Runs 39,874 jobs
Total CPU Time 664 days  
Total Wall Time 4,163 days  
Total Interaction Time 904 days  
Users with > 10 mins of CPU Time 165 users  
Avg. Number of Simulation Runs/User 27 jobs  
Avg. Time between First and Last Simulation 162 days  
Repeat Users with > 10 Simulation Jobs 301 users  
Repeat Users with > 3 Months 9 420 users  
Table 3: Miscellaneous Statistics
Domains Served 14,020
Cumulative Interactive User Sessions 10 67,969
Cumulative Session Time 2,193 days
Visitors 11 304,498
Visits 12 707,875
New Accounts 1,833
Max User Logins 136 users on 2013-10-10
Web Server Hits 24,073,120
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
99,573 87,680 28% 36% 18% 13% 4,548 94% 3% 3% 0%
- Registered Users 2
2,787 2,781 57% 17% 13% 11% 264 78% 14% 6% 2%
- Unregistered Interactive Users 3
13,416 11,492 22% 53% 14% 9% 567 92% 2% 6% 0%
- Unregistered Download Users 4
83,370 73,407 28% 34% 19% 14% 3,717 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.