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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
971 555 48% 19% 26% 7% 150 94% 4% 1% 1%
- Simulation Users 5
283 2 100% 0% 0% 0% 13 100% 0% 0% 0%
- Interactive Users 6
544 453 77% 9% 11% 4% 162 100% 0% 0% 0%
- Download Users 7
435 417 55% 17% 22% 6% 54 93% 0% 7% 0%
Table 2: Simulation Usage
Simulation Users 5 283 users
Simulation Runs 1,917 jobs
Total CPU Time 12 hours  
Total Wall Time 2,005 days  
Total Interaction Time 70 days  
Users with > 10 mins of CPU Time 4 users  
Avg. Number of Simulation Runs/User 7 jobs  
Avg. Time between First and Last Simulation 501,178 days  
Repeat Users with > 10 Simulation Jobs 19 users  
Repeat Users with > 3 Months 9 19 users  
Table 3: Miscellaneous Statistics
Domains Served 1,426
Cummulative Interactive User Sessions 10 1,601
Cummulative Session Time 450 days
Visitors 11 6,823
Visits 12 16,415
New Accounts 270
Max User Logins 113 users on 2011-12-01
Web Server Hits 1,361,526
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
971 555 48% 19% 26% 7% 150 94% 4% 1% 1%
- Registered Users 2
332 3 100% 0% 0% 0% 30 93% 0% 3% 3%
- Unregistered Interactive Users 3
275 202 50% 18% 24% 7% 52 100% 0% 0% 0%
- Unregistered Download Users 4
364 350 47% 20% 27% 7% 68 90% 9% 1% 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.