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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
59,175 42,569 33% 27% 25% 14% 4,123 93% 3% 4% 0%
- Simulation Users 5
1,585 1,580 64% 13% 14% 9% 139 83% 9% 7% 1%
- Interactive Users 6
10,674 8,363 47% 26% 17% 11% 1,141 97% 0% 2% 0%
- Download Users 7
50,256 35,560 32% 27% 26% 15% 939 97% 0% 2% 0%
Table 2: Simulation Usage
Simulation Users 5 1,585 users
Simulation Runs 107,652 jobs
Total CPU Time 924 days  
Total Wall Time 7,146 days  
Total Interaction Time 1,255 days  
Users with > 10 mins of CPU Time 214 users  
Avg. Number of Simulation Runs/User 68 jobs  
Avg. Time between First and Last Simulation 589 days  
Repeat Users with > 10 Simulation Jobs 325 users  
Repeat Users with > 3 Months 9 436 users  
Table 3: Miscellaneous Statistics
Domains Served 13,781
Cummulative Interactive User Sessions 10 58,302
Cummulative Session Time 2,847 days
Visitors 11 230,698
Visits 12 478,897
New Accounts 2,122
Max User Logins 190 users on 2013-04-17
Web Server Hits 36,896,187
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
59,175 42,569 33% 27% 25% 14% 4,123 93% 3% 4% 0%
- Registered Users 2
3,023 3,009 65% 13% 14% 8% 270 81% 10% 7% 1%
- Unregistered Interactive Users 3
8,191 6,103 37% 30% 19% 13% 892 95% 2% 4% 0%
- Unregistered Download Users 4
47,961 33,457 29% 28% 27% 15% 2,961 94% 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.