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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
44,748 42,471 33% 32% 18% 13% 2,460 93% 3% 4% 0%
- Simulation Users 5
417 416 60% 11% 13% 13% 42 79% 17% 5% 0%
- Interactive Users 6
5,829 5,442 36% 36% 17% 9% 529 98% 0% 2% 0%
- Download Users 7
40,928 38,958 34% 30% 18% 13% 731 97% 0% 2% 0%
Table 2: Simulation Usage
Simulation Users 5 417 users
Simulation Runs 10,154 jobs
Total CPU Time 99 days  
Total Wall Time 913 days  
Total Interaction Time 77 days  
Users with > 10 mins of CPU Time 73 users  
Avg. Number of Simulation Runs/User 24 jobs  
Avg. Time between First and Last Simulation 194 days  
Repeat Users with > 10 Simulation Jobs 86 users  
Repeat Users with > 3 Months 9 131 users  
Table 3: Miscellaneous Statistics
Domains Served 9,146
Cumulative Interactive User Sessions 10 20,722
Cumulative Session Time 637 days
Visitors 11 126,604
Visits 12 278,651
New Accounts 456
Max User Logins 87 users on 2015-01-12
Web Server Hits 6,734,855
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
44,748 42,471 33% 32% 18% 13% 2,460 93% 3% 4% 0%
- Registered Users 2
930 925 60% 17% 11% 10% 103 82% 14% 4% 1%
- Unregistered Interactive Users 3
4,591 4,247 27% 41% 19% 10% 244 93% 2% 5% 0%
- Unregistered Download Users 4
39,227 37,299 33% 31% 18% 13% 2,113 94% 3% 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.