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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
17,904 16,865 32% 33% 17% 13% 1,048 92% 3% 5% 0%
- Simulation Users 5
167 167 61% 12% 14% 11% 21 76% 19% 5% 0%
- Interactive Users 6
2,345 2,187 37% 36% 15% 9% 250 99% 0% 1% 0%
- Download Users 7
16,794 15,870 34% 31% 17% 13% 418 96% 1% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 167 users
Simulation Runs 3,829 jobs
Total CPU Time 4 days  
Total Wall Time 428 days  
Total Interaction Time 17 days  
Users with > 10 mins of CPU Time 31 users  
Avg. Number of Simulation Runs/User 23 jobs  
Avg. Time between First and Last Simulation 233 days  
Repeat Users with > 10 Simulation Jobs 25 users  
Repeat Users with > 3 Months 9 56 users  
Table 3: Miscellaneous Statistics
Domains Served 4,832
Cumulative Interactive User Sessions 10 6,208
Cumulative Session Time 221 days
Visitors 11 50,094
Visits 12 95,920
New Accounts 185
Max User Logins 69 users on 2015-03-13
Web Server Hits 2,210,706
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
17,904 16,865 32% 33% 17% 13% 1,048 92% 3% 5% 0%
- Registered Users 2
435 433 59% 19% 12% 9% 53 83% 13% 4% 0%
- Unregistered Interactive Users 3
1,709 1,577 25% 45% 17% 10% 72 88% 0% 13% 0%
- Unregistered Download Users 4
15,760 14,855 32% 32% 17% 14% 923 93% 3% 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 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.