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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
7,667 6,732 35% 33% 17% 11% 511 94% 3% 3% 0%
- Simulation Users 5
130 128 57% 21% 9% 10% 22 73% 27% 0% 0%
- Interactive Users 6
3,347 2,575 54% 28% 10% 7% 521 99% 0% 0% 0%
- Download Users 7
5,263 5,063 34% 31% 18% 12% 229 99% 0% 1% 0%
Table 2: Simulation Usage
Simulation Users 5 130 users
Simulation Runs 2,384 jobs
Total CPU Time 1 days  
Total Wall Time 522 days  
Total Interaction Time 20 days  
Users with > 10 mins of CPU Time 18 users  
Avg. Number of Simulation Runs/User 18 jobs  
Avg. Time between First and Last Simulation 272 days  
Repeat Users with > 10 Simulation Jobs 26 users  
Repeat Users with > 3 Months 9 54 users  
Table 3: Miscellaneous Statistics
Domains Served 4,588
Cumulative Interactive User Sessions 10 13,946
Cumulative Session Time 402 days
Visitors 11 45,484
Visits 12 118,497
New Accounts 131
Max User Logins 116 users on 2014-10-07
Web Server Hits 2,959,669
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
7,667 6,732 35% 33% 17% 11% 511 94% 3% 3% 0%
- Registered Users 2
487 483 72% 14% 7% 6% 70 84% 11% 3% 1%
- Unregistered Interactive Users 3
2,399 1,658 38% 38% 13% 8% 226 96% 1% 3% 0%
- Unregistered Download Users 4
4,781 4,591 30% 33% 19% 13% 215 95% 2% 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.