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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
29,707 28,674 41% 31% 17% 11% 4,402 64% 4% 3% 30%
- Simulation Users 5
33 25 88% 4% 0% 8% 16 88% 6% 0% 6%
- Interactive Users 6
3,939 3,910 81% 10% 5% 4% 1,397 98% 1% 1% 0%
- Download Users 7
29,740 29,581 44% 30% 16% 10% 4,627 94% 3% 2% 0%
Table 2: Simulation Usage
Simulation Users 5 33 users
Simulation Runs 303 jobs
Total CPU Time 25 minutes  
Total Wall Time 1,796 days  
Total Interaction Time 18 days  
Users with > 10 mins of CPU Time 2 users  
Avg. Number of Simulation Runs/User 9 jobs  
Avg. Time between First and last Simualtion 159 days  
Repeat Users with > 10 Simulation Jobs 8 users  
Repeat Users with > 3 Months 9 11 users  
Table 3: Miscellaneous Statistics
Domains Served 6,605
Cummulative Interactive User Sessions 10 9,462
Cummulative Session Time 241 days
Visitors 11 67,456
Visits 12 285,889
New Accounts 2,222
Max User Logins 214 users on 2010-01-11
Web Server Hits 7,316,412
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
29,707 28,674 41% 31% 17% 11% 4,402 64% 4% 3% 30%
- Registered Users 2
2,239 1,339 90% 6% 1% 3% 1,380 1% 3% 1% 95%
- Unregistered Interactive Users 3
1,952 1,942 69% 18% 8% 6% 394 97% 1% 1% 0%
- Unregistered Download Users 4
25,516 25,393 37% 33% 19% 11% 2,628 92% 5% 4% 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 podcas"\t". 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 podcas"\t". 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. Based on MIT OCW metric of Visitors: Visitors are identified as Unique IP addresses
  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.