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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
94,160 85,751 31% 34% 17% 14% 4,578 94% 3% 4% 0%
- Simulation Users 5
738 737 58% 15% 12% 13% 72 81% 15% 4% 0%
- Interactive Users 6
11,901 10,912 33% 38% 18% 11% 682 97% 1% 2% 0%
- Download Users 7
85,037 77,659 32% 33% 17% 14% 988 96% 1% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 738 users
Simulation Runs 26,965 jobs
Total CPU Time 917 days  
Total Wall Time 9,790 days  
Total Interaction Time 303 days  
Users with > 10 mins of CPU Time 179 users  
Avg. Number of Simulation Runs/User 37 jobs  
Avg. Time between First and Last Simulation 209 days  
Repeat Users with > 10 Simulation Jobs 185 users  
Repeat Users with > 3 Months 9 237 users  
Table 3: Miscellaneous Statistics
Domains Served 15,091
Cumulative Interactive User Sessions 10 43,756
Cumulative Session Time 1,385 days
Visitors 11 272,176
Visits 12 579,186
New Accounts 815
Max User Logins 114 users on 2015-06-02
Web Server Hits 15,144,404
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
94,160 85,751 31% 34% 17% 14% 4,578 94% 3% 4% 0%
- Registered Users 2
1,657 1,479 57% 18% 11% 12% 153 83% 12% 4% 1%
- Unregistered Interactive Users 3
9,911 8,997 27% 41% 19% 11% 507 94% 3% 3% 0%
- Unregistered Download Users 4
82,592 75,275 31% 33% 17% 14% 3,918 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.