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You are here: Home » Usage » Overview » By Calendar Year

Usage: Overview

Table 1: User statistics
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
105,035 90,732 30% 34% 17% 15% 4,644 94% 3% 4% 0%
- Simulation Users 5
779 778 57% 15% 11% 13% 77 81% 16% 4% 0%
- Interactive Users 6
13,087 11,585 33% 38% 17% 11% 693 97% 1% 2% 0%
- Download Users 7
94,818 82,055 31% 33% 17% 15% 1,004 97% 0% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 779 users
Simulation Runs 27,630 jobs
Total CPU Time 917 days  
Total Wall Time 10,046 days  
Total Interaction Time 320 days  
Users with > 10 mins of CPU Time 185 users  
Avg. Number of Simulation Runs/User 35 jobs  
Avg. Time between First and Last Simulation 216 days  
Repeat Users with > 10 Simulation Jobs 194 users  
Repeat Users with > 3 Months 9 259 users  
Table 3: Miscellaneous Statistics
Domains Served 15,697
Cumulative Interactive User Sessions 10 47,490
Cumulative Session Time 1,504 days
Visitors 11 305,162
Visits 12 641,385
New Accounts 875
Max User Logins 114 users on 2015-06-02
Web Server Hits 17,112,476
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
105,035 90,732 30% 34% 17% 15% 4,644 94% 3% 4% 0%
- Registered Users 2
1,749 1,569 56% 19% 11% 12% 158 84% 12% 4% 1%
- Unregistered Interactive Users 3
11,006 9,577 27% 41% 18% 12% 522 93% 3% 4% 0%
- Unregistered Download Users 4
92,280 79,586 30% 33% 17% 15% 3,964 94% 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.
  14. Metrics are calculated and updated at the beginning of each month.