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You are here: About Us › 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
1,688 1,429 45% 26% 15% 14% 385 97% 1% 2% 1%
- Simulation Users 5
2 0 0% 0% 0% 0% 0 0% 0% 0% 0%
- Interactive Users 6
476 466 54% 17% 11% 19% 87 98% 0% 2% 0%
- Download Users 7
1,336 1,316 48% 24% 13% 16% 46 96% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 2 users
Simulation Runs 5 jobs
Total CPU Time 0 seconds  
Total Wall Time 84 days  
Total Interaction Time 4 days  
Users with > 10 mins of CPU Time 0 users  
Avg. Number of Simulation Runs/User 3 jobs  
Avg. Time between First and Last Simulation 417 days  
Repeat Users with > 10 Simulation Jobs 0 users  
Repeat Users with > 3 Months 9 2 users  
Table 3: Miscellaneous Statistics
Domains Served 1,866
Cummulative Interactive User Sessions 10 2,917
Cummulative Session Time 335 days
Visitors 11 9,645
Visits 12 25,524
New Accounts 254
Max User Logins 34 users on 2012-02-23
Web Server Hits 1,252,099
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
1,688 1,429 45% 26% 15% 14% 385 97% 1% 2% 1%
- Registered Users 2
274 40 90% 0% 0% 10% 231 97% 1% 0% 1%
- Unregistered Interactive Users 3
240 233 37% 32% 20% 11% 28 100% 0% 0% 0%
- Unregistered Download Users 4
1,174 1,156 45% 26% 14% 14% 126 94% 0% 6% 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.