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You are here: HomeUsageOverviewPrior 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
4,335 3,170 19% 60% 16% 4% 159 84% 3% 13% 0%
- Simulation Users 5
12 1 100% 0% 0% 0% 1 100% 0% 0% 0%
- Interactive Users 6
2,886 2,338 11% 73% 13% 2% 31 81% 0% 19% 0%
- Download Users 7
1,195 1,063 39% 30% 18% 9% 29 76% 0% 24% 0%
Table 2: Simulation Usage
Simulation Users 5 12 users
Simulation Runs 7,192 jobs
Total CPU Time 6 hours  
Total Wall Time 26 days  
Total Interaction Time 16 days  
Users with > 10 mins of CPU Time 5 users  
Avg. Number of Simulation Runs/User 599 jobs  
Avg. Time between First and Last Simulation 540 days  
Repeat Users with > 10 Simulation Jobs 5 users  
Repeat Users with > 3 Months 9 8 users  
Table 3: Miscellaneous Statistics
Domains Served 2,773
Cummulative Interactive User Sessions 10 8,181
Cummulative Session Time 877 days
Visitors 11 39,480
Visits 12 133,925
New Accounts 474
Max User Logins 16 users on 2014-07-17
Web Server Hits 2,706,895
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
4,335 3,170 19% 60% 16% 4% 159 84% 3% 13% 0%
- Registered Users 2
495 2 100% 0% 0% 0% 13 85% 0% 15% 0%
- Unregistered Interactive Users 3
2,676 2,135 10% 74% 14% 2% 31 97% 3% 0% 0%
- Unregistered Download Users 4
1,164 1,033 38% 31% 19% 9% 115 81% 3% 17% 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.