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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
77,555 65,143 30% 35% 17% 14% 3,108 93% 3% 4% 0%
- Simulation Users 5
1,132 1,131 60% 16% 12% 11% 106 83% 12% 4% 1%
- Interactive Users 6
13,152 10,845 28% 49% 13% 8% 721 96% 0% 4% 0%
- Download Users 7
66,107 55,885 31% 32% 18% 14% 862 96% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,132 users
Simulation Runs 32,572 jobs
Total CPU Time 721 days  
Total Wall Time 3,679 days  
Total Interaction Time 821 days  
Users with > 10 mins of CPU Time 158 users  
Avg. Number of Simulation Runs/User 29 jobs  
Avg. Time between First and Last Simulation 830 days  
Repeat Users with > 10 Simulation Jobs 248 users  
Repeat Users with > 3 Months 9 365 users  
Table 3: Miscellaneous Statistics
Domains Served 12,412
Cumulative Interactive User Sessions 10 61,577
Cumulative Session Time 1,862 days
Visitors 11 256,732
Visits 12 630,213
New Accounts 1,394
Max User Logins 131 users on 2014-07-16
Web Server Hits 19,523,618
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
77,555 65,143 30% 35% 17% 14% 3,108 93% 3% 4% 0%
- Registered Users 2
2,263 2,256 59% 18% 11% 11% 229 79% 14% 5% 3%
- Unregistered Interactive Users 3
11,403 9,169 21% 55% 14% 8% 400 92% 1% 7% 0%
- Unregistered Download Users 4
63,889 53,718 30% 32% 18% 15% 2,479 94% 3% 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.