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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
125,550 121,455 29% 34% 18% 14% 5,967 95% 2% 3% 0%
- Simulation Users 5
928 926 56% 15% 13% 14% 79 78% 16% 5% 0%
- Interactive Users 6
19,400 18,666 28% 40% 19% 12% 953 97% 0% 2% 0%
- Download Users 7
109,233 105,810 31% 33% 18% 14% 1,144 97% 0% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 928 users
Simulation Runs 36,340 jobs
Total CPU Time 1,079 days  
Total Wall Time 21,207 days  
Total Interaction Time 295 days  
Users with > 10 mins of CPU Time 241 users  
Avg. Number of Simulation Runs/User 39 jobs  
Avg. Time between First and Last Simulation 203 days  
Repeat Users with > 10 Simulation Jobs 203 users  
Repeat Users with > 3 Months 9 298 users  
Table 3: Miscellaneous Statistics
Domains Served 18,059
Cumulative Interactive User Sessions 10 72,750
Cumulative Session Time 2,231 days
Visitors 11 357,201
Visits 12 845,568
New Accounts 1,262
Max User Logins 116 users on 2014-10-07
Web Server Hits 21,957,532
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
125,550 121,455 29% 34% 18% 14% 5,967 95% 2% 3% 0%
- Registered Users 2
2,075 2,069 57% 19% 11% 11% 194 82% 12% 4% 2%
- Unregistered Interactive Users 3
17,015 16,315 23% 43% 20% 12% 886 95% 2% 3% 0%
- Unregistered Download Users 4
106,460 103,071 30% 33% 18% 14% 4,887 95% 2% 3% 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.
  14. Metrics are calculated and updated at the beginning of each month.