Hi everyone,
I am running a model that requires a Beta distribution with parameters 0.62 and 0.82 but apparently with Vensim, more parameters like shift and scale are needed.Can anyone please guide me through the calculation method for these extra parameters so I can run the model successfully?
Search found 15 matches
- Sun Jun 02, 2019 6:05 am
- Forum: Vensim
- Topic: Distribution Help!!!
- Replies: 2
- Views: 1690
- Tue Apr 30, 2019 9:47 am
- Forum: Vensim
- Topic: Floating error
- Replies: 7
- Views: 4304
Re: Floating error
Hi everyone my model is giving me this error for a flow variable of mine at time 0 whenever I try to run it.can anyone help me with this issue and please state: -Is the issue with the variable equations? -Should I be looking at the cause diagrams and fix that? -Could it be related to the whole model...
- Tue Apr 30, 2019 8:55 am
- Forum: Vensim
- Topic: Using Time Steps
- Replies: 5
- Views: 2520
Re: Using Time Steps
How about: Is First Run = 0 ~ dmnl ~ switch indicating whether or not this is a first run Defined value var 1 = ... ~ something Initial var 2 = ... ~ something Var 2 = IF THEN ELSE( is first run, Initial var 2, functionOf(Defined value var 1) ) If you tell us something about the problem you're tryi...
- Sun Apr 28, 2019 9:57 am
- Forum: Vensim
- Topic: Using Time Steps
- Replies: 5
- Views: 2520
Re: Using Time Steps
My aim is for variable no.2 to have an initial value just for the first time the model is run, other then that I want it to have a function that is defined and is depended on variable no.1.
- Sun Apr 28, 2019 7:55 am
- Forum: Vensim
- Topic: Defining Units
- Replies: 4
- Views: 2154
Re: Defining Units
I've been defining the units but for defining the cost of hiring, I had to use 200*"staff no." and the software's unit checking part gives me an error that the unit of money for cost of hiring isn't correct... Is there any way I could get rid of this error besides defining a new variable f...
- Sun Apr 28, 2019 7:43 am
- Forum: Vensim
- Topic: Defining Units
- Replies: 4
- Views: 2154
Re: Defining Units
Definitely - percent is important because it's easy to inadvertently mix % and fractions. Define a variable called "100 percent" with units of "percent" and use that to convert between the two. Something like: "100 percent" == 100 ~ percent birth rate = 2.3 ~ percent/y...
- Fri Apr 26, 2019 12:15 pm
- Forum: Vensim
- Topic: Questions about random Weibull
- Replies: 15
- Views: 7024
- Fri Apr 26, 2019 12:14 pm
- Forum: Vensim
- Topic: Defining Units
- Replies: 4
- Views: 2154
Defining Units
Hi everyone
I have a homework model and we are told to define the units.My question is, Should we add units for binary and Dimensionless variables, like numbers and percents?
Would be great if you guys could help me out!
I have a homework model and we are told to define the units.My question is, Should we add units for binary and Dimensionless variables, like numbers and percents?
Would be great if you guys could help me out!
- Fri Apr 26, 2019 12:02 pm
- Forum: Vensim
- Topic: Using Time Steps
- Replies: 5
- Views: 2520
Using Time Steps
Hi everyone A homework model in vensim that I have starts from a variable no.1 that depends on the value of variable no.2, but variable no.2 only has an initial value and after each run time, a new value is measured for it.I unfortunately have problems running the model. My questions are: Is it even...
- Mon Apr 22, 2019 3:38 am
- Forum: Vensim
- Topic: a Question about units
- Replies: 4
- Views: 3552
Re: a Question about units
Hi everyone
Can someone tell me how I can access the current units defined in Vensim PLE and choose from them? and how I can edit the units list just for one model?
Can someone tell me how I can access the current units defined in Vensim PLE and choose from them? and how I can edit the units list just for one model?
- Sat Apr 20, 2019 9:47 am
- Forum: Vensim
- Topic: Run a model but simultaneous equations involving
- Replies: 1
- Views: 1516
Run a model but simultaneous equations involving
Hi everyone I seem to be having the same error in regards to my initial variables, and they happen to also be auxiliary variables with initial values.could someone please explain a level variable more and tell me whether the error is usually from the variables or it could also be from the relations ...
- Thu Apr 18, 2019 2:08 pm
- Forum: Vensim
- Topic: Questions about random Weibull
- Replies: 15
- Views: 7024
Re: Questions about random Weibull
Hi Tomfid I had tried the sample model and have also studied and thoroughly read your help page before but I still had the same problem.I think it would be better if you could provide me with some additional information about what the standard parameters of this function in Vensim define.I think tha...
- Wed Apr 17, 2019 8:05 pm
- Forum: Vensim
- Topic: Questions about random Weibull
- Replies: 15
- Views: 7024
Re: Questions about random Weibull
Terminology for the Weibull distribution is not well standardized, and most sources don't use alpha and beta. Can you give us a reference you're trying to match? well I'm trying to use the function for the weibull distribution that I only have the two following parameters of alpha , the shape param...
- Wed Apr 17, 2019 7:52 pm
- Forum: Vensim
- Topic: Random Weibull Distribution Parameters
- Replies: 1
- Views: 1424
Random Weibull Distribution Parameters
Hi everyone I have a problem with the Random.Weibull function in Vensim: RANDOM WEIBULL(rW minimum, rW maximum, Weibull shape S, Weibull shift, "Weibull scale (mean)", seed) I currently have to run a problem which only has alpha and beta and I couldn't understand which parameters in the fu...
- Wed Apr 17, 2019 7:47 pm
- Forum: Vensim
- Topic: Questions about random Weibull
- Replies: 15
- Views: 7024
Re: Questions about random Weibull
Hi everybody
I have a problem regarding the random weibull distribution in vensim, can anybody tell me for which parameters in the distribution description I should enter beta and alpha?
I have a problem regarding the random weibull distribution in vensim, can anybody tell me for which parameters in the distribution description I should enter beta and alpha?