Search found 49 matches

by Bob Eberlein
Fri Jan 05, 2007 1:43 pm
Forum: SD Mailing List Archive
Topic: UPDATE List Protocal
Replies: 0
Views: 2336

UPDATE List Protocal

Posted by Bob Eberlein <bob@vensim.com> I am changing the From address on message posted to the list to simply show the send System Dynamics Mailing List. Many of you have been replying to messages with content intended for a poster and not the list. Such replies are simply lost as I do not approve ...
by Bob Eberlein
Sun Dec 31, 2006 2:45 pm
Forum: SD Mailing List Archive
Topic: ANNOUNCE Student Chapter Newsletter
Replies: 1
Views: 4943

ANNOUNCE Student Chapter Newsletter

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, That query was, I am afraid, somewhat confusing and the reposnses were even more confusing. I probably should not have posted the original query, and I have decided not to post the reponses. At the abstract level of variables named S1 and S2 clear...
by Bob Eberlein
Wed Oct 25, 2006 2:02 pm
Forum: SD Mailing List Archive
Topic: ANNOUNCE System Dynamics Mailing List Move
Replies: 1
Views: 2504

ANNOUNCE System Dynamics Mailing List Move

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, I have moved the system dynamics mailing list to a new home. The new post to address is: sdmail@lists.systemdynamics.org to manage your subscription or unsubscribe go to: http://www.systemdynamics.org/mailman/listinfo/sdmail This list uses the Mai...
by Bob Eberlein
Wed Oct 25, 2006 1:42 pm
Forum: SD Mailing List Archive
Topic: ANNOUNCE System Dynamics Mailing List Move
Replies: 1
Views: 2504

ANNOUNCE System Dynamics Mailing List Move

Posted by Bob Eberlein <bob@vensim.com> Hi Everyone, I have moved the system dynamics mailing list to a new home. The new post to address is: sdmail@lists.systemdynamics.org to manage your subscription or unsubscribe go to: http://www.systemdynamics.org/mailman/listinfo/sdmail This list uses the Mai...
by Bob Eberlein
Mon Jan 03, 2005 12:04 pm
Forum: SD Mailing List Archive
Topic: System Dynamics Mailing List Status
Replies: 1
Views: 2915

System Dynamics Mailing List Status

Hi Everyone, I have already run into some problems in the way this list is implemented. The best solution I have come up with is to have it appear that all messages are coming from system-dynamics@vensim.com - otherwise every time you post a message you will be bombarded with out of office replies. ...
by Bob Eberlein
Mon Jan 03, 2005 2:26 am
Forum: SD Mailing List Archive
Topic: System Dynamics Mailing List Status
Replies: 1
Views: 2915

System Dynamics Mailing List Status

Hi Everyone, Happy New Year. As many of you have noticed the system dynamics mailing list has not been working very well recently. To make things better I have moved the list to a new server. To post messages to the list send them to sdmail@listserv.albany.edu there is no e on the listserv. To subsc...
by Bob Eberlein
Tue Oct 26, 2004 12:05 am
Forum: SD Mailing List Archive
Topic: Job Opening at Ventana Systems, Inc.
Replies: 0
Views: 4528

Job Opening at Ventana Systems, Inc.

Ventana Systems, Inc. builds simulations models of complex situations to help organizations choose the best policies and investments, as judged by the outcomes that define the organization’s success. We concentrate on top-level problems of corporations, government, the economy, and the environment. ...
by Bob Eberlein
Wed Aug 25, 2004 9:29 pm
Forum: SD Mailing List Archive
Topic: ANNOUNCE The MIT D-Memo Collection on DVD
Replies: 0
Views: 2556

ANNOUNCE The MIT D-Memo Collection on DVD

Hi Everyone, The System Dynamics Society is pleased to announce that the DVD version of the MIT System Dynamics Group Literature Collection, selected by Jay W. Forrester is now available. (A CD version will be available later this year.) This collection includes the scanned D-Memos which are the int...
by Bob Eberlein
Wed Jul 21, 2004 11:20 pm
Forum: SD Mailing List Archive
Topic: ANNOUNCE New book - Mediated Modeling
Replies: 0
Views: 2475

ANNOUNCE New book - Mediated Modeling

Forwarded from Susan Soldavin: New Book Offers Real-World Environmental Modeling Solutions Mediated modeling is an innovative new approach that uses the process of building computer models as a tool to help solve complex environmental policy and management problems. Rather than having outside expert...
by Bob Eberlein
Wed May 19, 2004 1:23 am
Forum: SD Mailing List Archive
Topic: List activity and conference registration deadline
Replies: 0
Views: 2286

List activity and conference registration deadline

Hi Everyone, The list has been completely silent for some time. Something about the dynamics of conversation that I do not fully understand. If you are getting this, however, you may rest assured that you are still subscribed. I also want to remind people that the early registration deadline for the...
by Bob Eberlein
Mon Mar 29, 2004 8:57 pm
Forum: System Dynamics Discussion
Topic: Mailing List Archives Online
Replies: 6
Views: 5241

Mailing List Archives Online

Hi Everyone, I am pleased to be able to tell you that Tony Kennedy has successfully put the archives from this mailing list up on a searchable discussion board. Posts on a subject have been combined in threads and most of the email headers stripped out so that you can see just the discussion. The ar...
by Bob Eberlein
Sun Feb 01, 2004 8:33 pm
Forum: SD Mailing List Archive
Topic: Balancing Activity in Investigating Dynamic Problems
Replies: 5
Views: 3637

Balancing Activity in Investigating Dynamic Problems

(was Using Statistics in Dynamics Models, Do we need to Simulate to Validate Models?) The discussion of statistics and simulation has been very interesting but I fear perhaps somewhat abstract and theoretical in nature. A number of the points that Jim Hines has raised are fundamentally more practica...
by Bob Eberlein
Tue Jan 13, 2004 8:45 am
Forum: SD Mailing List Archive
Topic: 2004 System Dynamics Conference Registration Information
Replies: 0
Views: 1976

2004 System Dynamics Conference Registration Information

New registration information about the2004 International Conference of the System Dynamics Society, to be held in Oxford, England, July 25-29, has just been posted on the Society website. Please visit http://www.systemdynamics.org and go to the "2004 Conference" page. Under "Conference Registration ...
by Bob Eberlein
Sun Jan 11, 2004 8:00 am
Forum: SD Mailing List Archive
Topic: Can SD models be validated without being run?
Replies: 38
Views: 19619

Can SD models be validated without being run?

Hi Everyone, I have enjoyed this discussion but one very important thing has not been emphasized. Kim asks why we dont simply validate mode relationships by running regressions. As long as there are observations on all model variables that is something that can be done and, if the observations are a...
by Bob Eberlein
Mon Nov 24, 2003 3:58 pm
Forum: SD Mailing List Archive
Topic: REMINDER Call for Papers - 2004 ISDC
Replies: 0
Views: 4440

REMINDER Call for Papers - 2004 ISDC

8 Please find below conference information and the Call for Papers, Presentations, Workshops and Sessions for the 22nd International Conference of the System Dynamics Society. Space is limited at the conference venue and early registration is essential. Registration materials will be available in Ja...
by Bob Eberlein
Fri Oct 03, 2003 1:24 pm
Forum: SD Mailing List Archive
Topic: Call for Papers - 2004 ISDC
Replies: 0
Views: 2045

Call for Papers - 2004 ISDC

Hi Everyone, For those who have not aleady received this here is the call for papers for next summers system dynamics conference in Oxford England. Bob Eberlein bob@vensim.com Please find below conference information and the Call for Papers, Presentations, Workshops and Sessions for the 22nd Interna...
by Bob Eberlein
Wed Jun 11, 2003 8:24 am
Forum: SD Mailing List Archive
Topic: Community Forum
Replies: 10
Views: 13710

Community Forum

Hi Rutger, I am the one who runs the system-dynamics mailing list. I have looked into yahoo groups, and I dont like them. They have annoying ads and they archive things for only a month or two. The system dynamics mailing list has archives going back to December of 1994 ( http://www.vensim.com/sdmai...
by Bob Eberlein
Sun May 11, 2003 7:04 am
Forum: SD Mailing List Archive
Topic: Number of replications
Replies: 5
Views: 3573

Number of replications

Hi Ric, The answer depends very much on what you are trying to do by introducing noise as well as the model you are using. If you are looking at steady state statistics then take a look at the textbook meantioned in the other posts. There is a caveat on that, however. If you are dealing with models ...
by Bob Eberlein
Thu Apr 17, 2003 3:07 pm
Forum: SD Mailing List Archive
Topic: NYC Conference Program
Replies: 0
Views: 2317

NYC Conference Program

Hi Everyone, The program for the New York City Conference is starting to take form and I want to bring you up to date on where things are. I encourage you to get your registration in early and look forward to seeing you at the conference. More information on the conference is available from the soci...
by Bob Eberlein
Fri Mar 21, 2003 8:51 am
Forum: SD Mailing List Archive
Topic: Deadline for submissions for ISDC 2003 in New York
Replies: 0
Views: 2076

Deadline for submissions for ISDC 2003 in New York

Hi Everyone, Just a reminder that the deadline for submissions to the 2003 conference of the System Dynamics Society is next Friday, March 28. We are looking for work related to the theory and application of system dynamics. More details on the the requirements for submissions are available from htt...
by Bob Eberlein
Wed Feb 12, 2003 12:56 pm
Forum: SD Mailing List Archive
Topic: Early Deadline for System Dynamics Conference Submissions
Replies: 0
Views: 2049

Early Deadline for System Dynamics Conference Submissions

Hi Everyone, Just a reminder that the deadline for early review conference submission is this Friday February 14, and the final submission deadline is March 28. Submissions made by the 14th will be reviewed with a decision about placement returned by March 20. Works submitted after the 14th will hav...
by Bob Eberlein
Fri Dec 20, 2002 10:45 am
Forum: SD Mailing List Archive
Topic: Call for Submissions, System Dynamics Conference 2003
Replies: 0
Views: 4753

Call for Submissions, System Dynamics Conference 2003

Just a quick note to remind you about the deadlines and key dates for the 21st International Conference of the System Dynamics Society to be held in New York City, July 20 - 24, 2003. For complete information and updates, please visit our website: http://www.systemdynamics.org. NEW INFORMATION inclu...
by Bob Eberlein
Tue Jul 23, 2002 9:07 am
Forum: SD Mailing List Archive
Topic: ICSDS Call for Papers
Replies: 0
Views: 2168

ICSDS Call for Papers

I thought this might be of interest to people. Bob Eberlein bob@vensim.com International Conference on Systems, Development and Self-Organization (ICSDS2002) November 30--December 1, 2002, Beijing, China http://www.icsds.em.tsinghua.edu.cn Important Dates * July 30, 2002: 1-page, 300-word extended a...
by Bob Eberlein
Thu Jul 18, 2002 3:35 pm
Forum: SD Mailing List Archive
Topic: Using DT in Model Equations
Replies: 6
Views: 4585

Using DT in Model Equations

A couple of notes on DT and integration. Jim suggests that we use an equation such as: > outflow = if (stock > normally indicated outflow*dt) > then (normally indicated outflow) > else (0) but also says we should not confuse this dt with our solution interval (call it Time Step). If we really treat ...
by Bob Eberlein
Tue Jul 16, 2002 8:43 am
Forum: SD Mailing List Archive
Topic: Using DT in Model Equations
Replies: 6
Views: 4585

Using DT in Model Equations

Jim Hines wrote: > My point is just that dt can now be regarded as being just as rigorous > as any other real (or hyper-real) number -- zero, one, pi, etc. This > means that the Dynamo equations (and Euler integration in concept) are > correct **mathematically**. Of course, digital computers dont al...