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You are here: Usage › Overview › Prior 12 Months

Usage: Overview

Table 1: User statistics
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
964 822 51% 20% 18% 11% 224 91% 1% 8% 0%
- Simulation Users 5
16 5 100% 0% 0% 0% 6 100% 0% 0% 0%
- Interactive Users 6
405 386 60% 16% 12% 12% 89 98% 0% 2% 0%
- Download Users 7
658 641 53% 19% 16% 12% 60 98% 0% 2% 0%
Table 2: Simulation Usage
Simulation Users 5 16 users
Simulation Runs 86 jobs
Total CPU Time 4 minutes  
Total Wall Time 1,177 days  
Total Interaction Time 1 days  
Users with > 10 mins of CPU Time 0 users  
Avg. Number of Simulation Runs/User 5 jobs  
Avg. Time between First and Last Simulation 232 days  
Repeat Users with > 10 Simulation Jobs 3 users  
Repeat Users with > 3 Months 9 7 users  
Table 3: Miscellaneous Statistics
Domains Served 1,533
Cummulative Interactive User Sessions 10 1,517
Cummulative Session Time 407 days
Visitors 11 7,110
Visits 12 16,977
New Accounts 127
Max User Logins 21 users on 2011-03-02
Web Server Hits 1,817,960
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
964 822 51% 20% 18% 11% 224 91% 1% 8% 0%
- Registered Users 2
165 49 67% 0% 0% 33% 65 91% 2% 8% 0%
- Unregistered Interactive Users 3
254 240 53% 19% 19% 10% 56 93% 2% 5% 0%
- Unregistered Download Users 4
545 533 50% 22% 19% 10% 103 90% 1% 9% 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.