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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
258,791 244,654 27% 39% 24% 11% 37,122 93% 4% 2% 1%
- Simulation Users 5
12,529 5,677 45% 28% 19% 9% 5,818 90% 5% 1% 4%
- Interactive Users 6
61,735 58,049 34% 36% 19% 11% 10,208 94% 4% 2% 0%
- Download Users 7
231,047 229,214 27% 38% 24% 11% 29,543 95% 3% 2% 0%
Total Users (old defn) 8
74,271 - - - - - - - - - -
Table 2: Simulation Usage
Simulation Users 5 12,529 users
Simulation Runs 430,357 jobs
Total CPU Time 9,255 days  
Total Wall Time 37,668 days  
Total Interaction Time 8,474 days  
Users with > 10 mins of CPU Time 2,840 users  
Avg. Number of Simulation Runs/User 34 jobs  
Avg. Time between First and Last Simulation 1,654 days  
Repeat Users with > 10 Simulation Jobs 5,879 users  
Repeat Users with > 3 Months 9 2,996 users  
Table 3: Miscellaneous Statistics
Domains Served 15,759
Cummulative Interactive User Sessions 10 180,354
Cummulative Session Time 8,307 days
Visitors 11 540,063
Visits 12 1,455,291
New Accounts 13,877
Max User Logins 644 users on 2013-02-20
Web Server Hits 101,201,454
Table 4: Collaboration Usage
Shared Tool Sessions 13 117
New tools under development 68
Table 5: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
258,791 244,654 27% 39% 24% 11% 37,122 93% 4% 2% 1%
- Registered Users 2
20,260 7,883 44% 29% 18% 9% 8,095 88% 6% 2% 4%
- Unregistered Interactive Users 3
33,850 32,750 27% 40% 22% 11% 4,180 93% 4% 3% 0%
- Unregistered Download Users 4
204,681 204,021 26% 39% 24% 11% 24,847 95% 3% 2% 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.

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