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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
7,165 4,044 30% 33% 17% 16% 257 85% 7% 8% 0%
- Simulation Users 5
178 178 54% 16% 16% 11% 35 74% 23% 3% 0%
- Interactive Users 6
1,105 761 51% 24% 17% 6% 93 98% 0% 2% 0%
- Download Users 7
6,432 3,635 31% 33% 16% 16% 247 95% 0% 5% 0%
Table 2: Simulation Usage
Simulation Users 5 178 users
Simulation Runs 7,624 jobs
Total CPU Time 76 days  
Total Wall Time 269 days  
Total Interaction Time 70 days  
Users with > 10 mins of CPU Time 37 users  
Avg. Number of Simulation Runs/User 43 jobs  
Avg. Time between First and Last Simulation 244 days  
Repeat Users with > 10 Simulation Jobs 46 users  
Repeat Users with > 3 Months 9 75 users  
Table 3: Miscellaneous Statistics
Domains Served 2,322
Cumulative Interactive User Sessions 10 4,150
Cumulative Session Time 98 days
Visitors 11 25,796
Visits 12 44,264
New Accounts 136
Max User Logins 115 users on 2014-06-19
Web Server Hits 1,638,067
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
7,165 4,044 30% 33% 17% 16% 257 85% 7% 8% 0%
- Registered Users 2
451 449 68% 13% 9% 8% 81 83% 14% 2% 1%
- Unregistered Interactive Users 3
821 488 34% 32% 24% 8% 27 89% 0% 11% 0%
- Unregistered Download Users 4
5,893 3,107 24% 36% 17% 18% 149 85% 5% 10% 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.