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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
69,637 50,779 29% 34% 18% 14% 3,718 94% 3% 3% 0%
- Simulation Users 5
981 974 59% 12% 14% 13% 85 82% 14% 4% 1%
- Interactive Users 6
10,977 7,649 37% 36% 13% 11% 800 97% 1% 3% 0%
- Download Users 7
60,723 45,028 29% 33% 18% 15% 814 96% 1% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 981 users
Simulation Runs 21,191 jobs
Total CPU Time 318 days  
Total Wall Time 2,120 days  
Total Interaction Time 351 days  
Users with > 10 mins of CPU Time 66 users  
Avg. Number of Simulation Runs/User 22 jobs  
Avg. Time between First and Last Simulation 153 days  
Repeat Users with > 10 Simulation Jobs 159 users  
Repeat Users with > 3 Months 9 292 users  
Table 3: Miscellaneous Statistics
Domains Served 11,382
Cumulative Interactive User Sessions 10 41,531
Cumulative Session Time 1,458 days
Visitors 11 208,183
Visits 12 432,131
New Accounts 1,072
Max User Logins 136 users on 2013-10-10
Web Server Hits 15,433,650
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
69,637 50,779 29% 34% 18% 14% 3,718 94% 3% 3% 0%
- Registered Users 2
1,840 1,836 58% 17% 13% 11% 184 78% 15% 6% 2%
- Unregistered Interactive Users 3
9,162 5,923 28% 42% 15% 12% 504 92% 2% 6% 0%
- Unregistered Download Users 4
58,635 43,020 27% 34% 19% 15% 3,030 96% 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.