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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
1,246 896 35% 32% 14% 18% 199 94% 3% 3% 1%
- Simulation Users 5
4 0 0% 0% 0% 0% 2 100% 0% 0% 0%
- Interactive Users 6
363 312 46% 22% 5% 27% 71 100% 0% 0% 0%
- Download Users 7
1,032 847 36% 28% 13% 22% 7 86% 14% 0% 0%
Table 2: Simulation Usage
Simulation Users 5 4 users
Simulation Runs 7 jobs
Total CPU Time 0 seconds  
Total Wall Time 14 minutes  
Total Interaction Time 14 minutes  
Users with > 10 mins of CPU Time 0 users  
Avg. Number of Simulation Runs/User 2 jobs  
Avg. Time between First and Last Simulation 234 days  
Repeat Users with > 10 Simulation Jobs 0 users  
Repeat Users with > 3 Months 9 1 users  
Table 3: Miscellaneous Statistics
Domains Served 1,407
Cummulative Interactive User Sessions 10 4,401
Cummulative Session Time 1,120 days
Visitors 11 7,317
Visits 12 23,608
New Accounts 103
Max User Logins 27 users on 2013-04-26
Web Server Hits 1,802,911
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
1,246 896 35% 32% 14% 18% 199 94% 3% 3% 1%
- Registered Users 2
146 13 85% 0% 0% 15% 93 95% 3% 1% 1%
- Unregistered Interactive Users 3
171 134 31% 44% 11% 13% 28 100% 0% 0% 0%
- Unregistered Download Users 4
929 749 35% 31% 15% 19% 78 91% 3% 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.