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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
29,965 23,330 38% 34% 14% 14% 1,902 88% 8% 3% 1%
- Simulation Users 5
18 15 47% 33% 13% 7% 9 78% 22% 0% 0%
- Interactive Users 6
2,567 2,056 68% 19% 8% 6% 317 95% 3% 2% 0%
- Download Users 7
28,251 21,928 37% 34% 15% 14% 252 95% 3% 2% 0%
Table 2: Simulation Usage
Simulation Users 5 18 users
Simulation Runs 48 jobs
Total CPU Time 17 minutes  
Total Wall Time 4 hours  
Total Interaction Time 3 hours  
Users with > 10 mins of CPU Time 0 users  
Avg. Number of Simulation Runs/User 3 jobs  
Avg. Time between First and Last Simulation 192 days  
Repeat Users with > 10 Simulation Jobs 1 users  
Repeat Users with > 3 Months 9 3 users  
Table 3: Miscellaneous Statistics
Domains Served 5,431
Cummulative Interactive User Sessions 10 15,735
Cummulative Session Time 1,728 days
Visitors 11 59,659
Visits 12 148,680
New Accounts 717
Max User Logins 136 users on 2013-04-18
Web Server Hits 5,340,153
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
29,965 23,330 38% 34% 14% 14% 1,902 88% 8% 3% 1%
- Registered Users 2
869 797 92% 5% 1% 2% 640 83% 13% 1% 3%
- Unregistered Interactive Users 3
1,654 1,288 52% 28% 12% 9% 163 98% 1% 1% 0%
- Unregistered Download Users 4
27,442 21,245 35% 35% 15% 14% 1,099 89% 6% 5% 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.