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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
44,308 43,611 30% 36% 17% 14% 2,140 94% 2% 4% 0%
- Simulation Users 5
334 334 56% 18% 9% 14% 42 79% 19% 2% 0%
- Interactive Users 6
6,009 5,930 36% 36% 17% 11% 433 97% 1% 2% 0%
- Download Users 7
40,345 39,718 31% 35% 16% 14% 636 96% 1% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 334 users
Simulation Runs 12,267 jobs
Total CPU Time 338 days  
Total Wall Time 2,767 days  
Total Interaction Time 90 days  
Users with > 10 mins of CPU Time 73 users  
Avg. Number of Simulation Runs/User 37 jobs  
Avg. Time between First and Last Simulation 282 days  
Repeat Users with > 10 Simulation Jobs 75 users  
Repeat Users with > 3 Months 9 124 users  
Table 3: Miscellaneous Statistics
Domains Served 9,197
Cumulative Interactive User Sessions 10 18,633
Cumulative Session Time 621 days
Visitors 11 131,780
Visits 12 242,204
New Accounts 465
Max User Logins 114 users on 2015-06-02
Web Server Hits 6,365,612
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
44,308 43,611 30% 36% 17% 14% 2,140 94% 2% 4% 0%
- Registered Users 2
911 909 57% 19% 9% 12% 91 82% 13% 4% 0%
- Unregistered Interactive Users 3
4,716 4,639 28% 40% 18% 11% 250 96% 2% 2% 0%
- Unregistered Download Users 4
38,681 38,063 29% 35% 17% 15% 1,799 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.