Usage: Usage Tables

Table 1: User statistics
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
9,280 7,015 63% 15% 13% 8% 235 83% 1% 11% 6%
- Simulation Users 5
391 26 92% 0% 4% 0% 48 69% 2% 10% 19%
- Interactive Users 6
3,094 2,791 41% 36% 15% 6% 131 94% 0% 6% 0%
- Download Users 7
5,886 5,416 67% 12% 10% 9% 41 100% 0% 0% 0%
Table 2: Simulation Usage
Simulation Users 5 391 users
Simulation Jobs 14,731 jobs
Total CPU Time 77 days  
Total Wall Time 1,195 days  
Total Interaction Time 387 days  
Users with > 10 mins of CPU Time 147 users  
Avg. Number of Simulation Jobs/User 38 jobs  
Avg. Time between First and Last Simulation 312 days  
Repeat Users with > 10 Simulation Jobs 173 users  
Repeat Users with > 3 Months 9 114 users  
Table 3: Miscellaneous Statistics
Domains Served 3,692
Cumulative Interactive User Sessions 10 11,794
Cumulative Session Time 798 days
Visitors 11 82,170
Visits 12 164,399
New Accounts 1,929
Max User Logins 51
Web Server Hits 6,771,399
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
9,280 7,015 63% 15% 13% 8% 235 83% 1% 11% 6%
- Registered Users 2
1,653 27 96% 0% 0% 0% 49 61% 2% 8% 29%
- Unregistered Interactive Users 3
1,868 1,699 48% 24% 21% 4% 71 92% 1% 7% 0%
- Unregistered Download Users 4
5,759 5,289 67% 12% 10% 9% 115 86% 0% 14% 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.