Search found 13 matches

by paulnewton
Tue Jul 04, 2017 8:37 pm
Forum: Ventity
Topic: Compare Runs Issue
Replies: 2
Views: 3955

Re: Compare Runs Issue

I've redone Exercise 1 and 2 and get the same issue as in my original post.
by paulnewton
Tue Jul 04, 2017 2:40 pm
Forum: Ventity
Topic: Compare Runs Issue
Replies: 2
Views: 3955

Compare Runs Issue

Tom, "Compare To..." is not working for me the way it is shown in Examples/Exercises - Start Here/2.Compare Runs/Stage 4: Examine Results. The most important issue is that I don't get a table comparing results of the two simulation runs. Also, though, the "Compare Settings" windo...
by paulnewton
Tue Jul 04, 2017 12:47 am
Forum: Ventity
Topic: Toggling Help Off
Replies: 2
Views: 3819

Toggling Help Off

Tom, in going through exercise help on my laptop, I notice I have to click on the upper right minus sign to minimize the exercise instructions so that I can see the Ventity screen. Then, when I'm ready to go back to the exercise help, I can use ALT-TAB. It would be much more convenient to be able to...
by paulnewton
Wed Sep 14, 2011 3:00 pm
Forum: Vensim
Topic: Model Notes not working properly in 5.11
Replies: 4
Views: 4218

Re: Model Notes not working properly in 5.11

Tony, I just used "Model Compare" last night for the first time in a while (first time since installing 5.11). The two models were exactly the same, but the message telling me this was split across a first message window, on which I clicked OK, and then got a second message window completi...
by paulnewton
Sun Aug 21, 2011 7:35 pm
Forum: Vensim
Topic: Model Notes not working properly in 5.11
Replies: 4
Views: 4218

Re: Model Notes not working properly in 5.11

Thanks! I have been using the model notes feature for years to track changes from one model version to the next. At work, there are five or six of us who collaborate on modeling and calibration on a given project, and I was just beginning to get others to use model notes as a way of communicating ch...
by paulnewton
Thu Aug 18, 2011 4:55 pm
Forum: Vensim
Topic: What improvements would you like to see in Vensim?
Replies: 150
Views: 11187292

Re: What improvements would you like to see in Vensim?

At my company, we have a problem presenting models. Our models have a lot of "spaghetti" and variable names that don't mean much to our clients. We use layering a lot, but this still doesn't allow us to hide variable names in an important loop that are irrelevant to our clients. It would b...
by paulnewton
Thu Aug 18, 2011 4:42 pm
Forum: Vensim
Topic: Model Notes not working properly in 5.11
Replies: 4
Views: 4218

Model Notes not working properly in 5.11

I just now installed DSS 5.11. Using Windows 7. In previous versions model notes showed completely in one "Message from Vensim" window upon opening a model. In 5.11, the model notes show one line at a time in multiple "Message from Vensim" windows, a new one of which opens each t...
by paulnewton
Sun May 18, 2008 6:48 pm
Forum: Vensim
Topic: There is a delay of one step between the simulated and obser
Replies: 5
Views: 4616

Hi JJ, Sorry, I didn't make it clear that I was responding to the original post and not to yours. I think I understand the difference between discrete time and continuous time models, but maybe I still have some areas of confusion. In any case, I do try to stay away from building discrete time model...
by paulnewton
Sat May 17, 2008 4:27 pm
Forum: Vensim
Topic: There is a delay of one step between the simulated and obser
Replies: 5
Views: 4616

Your equations with (t) and (t-1) time references indicate to me that you are building a "period" or "discrete time" model. Although there are ways to create such models in Vensim, Vensim is generally used to create "continuous time" models where TIME STEP (=DT) is smal...
by paulnewton
Mon May 12, 2008 5:50 am
Forum: Vensim
Topic: fractional retire rate = f(time since hire)
Replies: 6
Views: 5105

Bob, you wrote, "One solution is simply to use the shift on tenure and have the age subscript refer to age at hire - age at hire + tenure = current age." This sounds like a great idea and I've started working on modeling the problem this way. But I've been given initial workforce stocks, b...
by paulnewton
Fri May 09, 2008 10:02 pm
Forum: Vensim
Topic: fractional retire rate = f(time since hire)
Replies: 6
Views: 5105

Bob, you wrote, "It seems like 4 is just retirements[cohort] = workers[cohort] * fractional retire rate[cohort]" Actually the retirement rate is a function of age, whereas resignation rate is a function of time since being hired, and hiring takes place into multiple age groups. I've had no...
by paulnewton
Fri May 09, 2008 5:14 am
Forum: Vensim
Topic: fractional retire rate = f(time since hire)
Replies: 6
Views: 5105

fractional retire rate = f(time since hire)

Problem: a predictive model of workforce dynamics. Given: 1) initial values, at the start of a certain year, of workforce stocks by 5 year age groups from 21 to 75. 2) retire fraction for each 5 year age group over 50 3) hire fractions by 5 year age group, used to replace retirements, resignations, ...
by paulnewton
Wed Apr 30, 2008 8:39 pm
Forum: Vensim
Topic: displaying vgd file graphs
Replies: 1
Views: 2553

displaying vgd file graphs

Hi all, I'm new to this forum so please bear with me if I botch something up. I'm also new to building bar graphs and figured out from the Help that I needed to create a vgd file, which I did, one file containing six bar graphs, each bar graph of the form: :BAR-GRAPH EngrBar2020 :TITLE Engineers 202...