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You are here: Home » Usage » Overview » Prior 12 Months

Usage: Overview

Table 1: User statistics
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
153,416 148,301 28% 36% 18% 14% 6,932 94% 2% 3% 0%
- Simulation Users 5
1,210 1,208 56% 16% 12% 14% 100 79% 17% 4% 0%
- Interactive Users 6
24,454 23,495 27% 44% 18% 11% 1,169 96% 0% 3% 0%
- Download Users 7
132,211 127,977 29% 34% 18% 14% 1,297 96% 0% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 1,210 users
Simulation Runs 45,835 jobs
Total CPU Time 1,400 days  
Total Wall Time 23,384 days  
Total Interaction Time 473 days  
Users with > 10 mins of CPU Time 279 users  
Avg. Number of Simulation Runs/User 38 jobs  
Avg. Time between First and Last Simulation 199 days  
Repeat Users with > 10 Simulation Jobs 255 users  
Repeat Users with > 3 Months 9 385 users  
Table 3: Miscellaneous Statistics
Domains Served 20,741
Cumulative Interactive User Sessions 10 102,696
Cumulative Session Time 3,314 days
Visitors 11 444,402
Visits 12 1,193,524
New Accounts 1,803
Max User Logins 131 users on 2014-07-16
Web Server Hits 31,320,941
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
153,416 148,301 28% 36% 18% 14% 6,932 94% 2% 3% 0%
- Registered Users 2
2,712 2,705 57% 18% 10% 12% 243 82% 12% 4% 2%
- Unregistered Interactive Users 3
21,586 20,672 22% 46% 19% 11% 1,062 95% 2% 3% 0%
- Unregistered Download Users 4
129,118 124,924 28% 35% 18% 14% 5,627 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.