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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
67,335 55,888 31% 34% 17% 13% 2,813 93% 4% 4% 0%
- Simulation Users 5
1,028 1,017 60% 16% 13% 10% 102 83% 13% 3% 1%
- Interactive Users 6
11,428 9,555 29% 49% 13% 8% 650 96% 0% 4% 0%
- Download Users 7
57,477 47,806 33% 31% 17% 14% 812 96% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,028 users
Simulation Runs 29,366 jobs
Total CPU Time 576 days  
Total Wall Time 3,301 days  
Total Interaction Time 762 days  
Users with > 10 mins of CPU Time 151 users  
Avg. Number of Simulation Runs/User 29 jobs  
Avg. Time between First and Last Simulation 184 days  
Repeat Users with > 10 Simulation Jobs 235 users  
Repeat Users with > 3 Months 9 333 users  
Table 3: Miscellaneous Statistics
Domains Served 11,039
Cumulative Interactive User Sessions 10 48,620
Cumulative Session Time 1,463 days
Visitors 11 220,069
Visits 12 520,956
New Accounts 1,255
Max User Logins 131 users on 2014-07-16
Web Server Hits 16,499,801
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
67,335 55,888 31% 34% 17% 13% 2,813 93% 4% 4% 0%
- Registered Users 2
2,075 2,069 59% 18% 12% 10% 219 79% 14% 5% 2%
- Unregistered Interactive Users 3
9,847 8,032 21% 56% 14% 8% 339 92% 1% 7% 0%
- Unregistered Download Users 4
55,413 45,787 31% 32% 18% 14% 2,255 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.