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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
32,867 31,750 25% 43% 16% 13% 1,334 92% 3% 4% 0%
- Simulation Users 5
416 415 60% 16% 9% 13% 48 79% 19% 2% 0%
- Interactive Users 6
6,587 6,307 32% 48% 12% 7% 645 96% 0% 3% 0%
- Download Users 7
28,030 27,151 26% 41% 17% 13% 645 95% 0% 5% 0%
Table 2: Simulation Usage
Simulation Users 5 416 users
Simulation Runs 9,458 jobs
Total CPU Time 280 days  
Total Wall Time 859 days  
Total Interaction Time 113 days  
Users with > 10 mins of CPU Time 73 users  
Avg. Number of Simulation Runs/User 23 jobs  
Avg. Time between First and Last Simulation 220 days  
Repeat Users with > 10 Simulation Jobs 74 users  
Repeat Users with > 3 Months 9 165 users  
Table 3: Miscellaneous Statistics
Domains Served 7,682
Cumulative Interactive User Sessions 10 29,946
Cumulative Session Time 1,083 days
Visitors 11 109,034
Visits 12 347,956
New Accounts 541
Max User Logins 131 users on 2014-07-16
Web Server Hits 9,259,282
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
32,867 31,750 25% 43% 16% 13% 1,334 92% 3% 4% 0%
- Registered Users 2
1,136 1,133 67% 14% 7% 11% 146 84% 11% 3% 2%
- Unregistered Interactive Users 3
5,155 4,902 20% 57% 14% 7% 230 93% 1% 5% 0%
- Unregistered Download Users 4
26,576 25,715 24% 42% 17% 14% 958 93% 2% 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.