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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 1 124,788 126,752 126,152 128,415 135,668 137,460 139,463 143,168 145,151 148,637 153,416 155,802 155,802 145,178 28% 36% 18% 14% 7,062 94% 2% 3% 0%
- Simulation Users 5 1,648 1,672 1,581 1,510 1,447 1,463 1,437 1,405 1,324 1,293 1,208 1,187 1,189 1,187 56% 16% 12% 14% 101 79% 17% 4% 0%
- Interactive Users 6 5,419% 5,552% 5,834% 5,957% 6,064% 6,080% 6,047% 6,067% 5,951% 5,992% 6,333% 6,128% 23,715 22,259 28% 42% 18% 12% 1,088 97% 0% 3% 0%
- Download Users 7 36,680% 37,361% 34,923% 35,594% 37,000% 37,630% 38,152% 39,564% 40,367% 41,940% 43,928% 42,964% 135,354 126,277 30% 34% 18% 14% 1,272 96% 0% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 1,189 users  
Simulation Runs 46,701 jobs  
Total CPU Time 1,160 days  
Total Wall Time 23,458 days  
Total Interaction Time 545 days  
Users with > 10 mins of CPU Time 286 users  
Avg. Number of Simulation Runs/User 39 jobs  
Avg. Time between First and Last Simulation 202 days  
Repeat Users with > 10 Simulation Jobs 259 users  
Repeat Users with > 3 Months 9 381 users  
Table 3: Miscellaneous Statistics
Domains Served 20,726
Cumulative Interactive User Sessions 10 89,680
Cumulative Session Time 2,826 days
Visitors 11 453,680
Visits 12 1,079,632
New Accounts 1,435
Max User Logins 116 users on 2014-10-07
Web Server Hits 29,548,754
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1 124,788 126,752 126,152 128,415 135,668 137,460 139,463 143,168 145,151 148,637 153,416 155,802 155,802 145,178 28% 36% 18% 14% 7,062 94% 2% 3% 0%
- Registered Users 2 357% 358% 323% 315% 324% 327% 325% 319% 309% 331% 333% 289% 2,555 2,335 57% 18% 11% 12% 227 84% 11% 3% 1%
- Unregistered Interactive Users 3 812 820 900 952 1,013 1,027 1,016 1,007 1,021 1,042 1,062 1,052 20,968 19,580 23% 45% 19% 12% 1,052 95% 2% 3% 0%
- Unregistered Download Users 4 4,483% 4,517% 4,426% 4,333% 4,411% 4,543% 4,690% 4,948% 5,069% 5,164% 5,340% 5,484% 132,279 123,263 29% 34% 18% 14% 5,783 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.