Hi Cerigdon, It becomes computationally unwieldy when n gets very large (because the binomial coefficients with large numbers can be huge), but there is no ...
CB probably has some numerical issue for big parameters. Use normal distribution instead with mean np and variance np(1-p) - by the central limit theorem this...
I don't know how the my alternative works with rare events and large samples, however, it is worth investigating. I have looked probabilities in a model and...
Hi Rachael, Even though the Beta distribution may give results that look alright, it is not the right distribution to use in the situation described below....
I've tried to load an evaluation copy of CB Pro on my Win XP x64 Professional machine. .NET 2.0 (x64) is installed, and CBPro won't install. Does it only...
Hello everyone, I've been working on a project that requires me to run CB, using the Macros menu in Run Preferences, and an executable Fortran code (as an...
Thomas, Crystal Ball 7.x is supported only on .NET Framework 1.1 SP 1 and the installer does check for the presence of .NET Framework 1.1 and 1.1 SP 1 at ...
Greeting All, I'm a novice and just found something that I don't understand. Why do I have different percentile results in my Forecast when I run the CB...
Arief, Syamsul
sarief@...
Nov 17, 2005 2:14 pm
1235
The only difference is at 30%. The lability of the value there is probably because the cumulative probability distribution has a stair-step at 30%, and any...
Eric & Martin, Thanks for the kind response. But sorry, for me it is still clear as mud. Either english is not my mother tounge, I must have poor statistic...
Arief, Syamsul
sarief@...
Nov 18, 2005 2:39 am
1237
The 30th percentile is defined to be the value where 30% of the cases are less than it. In your case, 30% of the cases are 0, and 70% of them are up in the...
Hi, I just joined this group, and was hoping that someone could help with a strange error I am seeing. I am trying to use OptQuest to arrive at the best...
All: I need to work with beta distribution, and I have the following question: I am treating a variable on which I know the mean (=20), the coefficient of...
Sanjay, For your first part, my experiences with the same error messages are usually related with errors in the EXCEL calculations: 1 - overflow - some figures...
Hi all, Assume I have a Crystal Ball model which evaluates the profit by a given formula. I can get all kinds of analysis using Crystal Ball. My problem is, I...
Hello Yiannis, Great question! We did the calculations for you and the correspondence between the four parameters you provide (Mean, COV, Min, Max) and Crystal...
Hi, ... Though they are not defined for all (formal) distribution functions, you can usually characterize a distribution function by various statistics like...
Hi, Martin, Thanks a lot for your explanation. Probably I didn't state my question clearly. I'd like to repeat my question here: Assume in my model, the profit...
Hi, ... Ok, you want to perform a sensitivity analysis. You probably have to modify your spreadsheet model slightly. Create separate cells for the parameters...
Hello, I have been a user of 5.2 for some time now, and I have a complex model that calls Solver on multiple worksheets (through a macro that then calls a...
Dear, I just installed the Cristal Ball 2000.1, Student edition but i didn´t work out! The cause i think that my Windows isn´t 2000 but XP... Anybody could...
Hello, I want to use two distributions, with different parameter-values, but in each and every simulation I want them to use the same random number. Does...
Ric, Although the Solver and the Extreme Speed component are developed by the same company (Frontline Systems, Inc.), the architecture of Extreme Speed...
Sherman, Thanks for your feedback. This was what I had suspected but was not able to track it down. After your suggestion, I went and looked more closely....
I am looking for e-papers/articles describing Monte Carlo simulation for cost/schedule modeling of large software development projects. Would appreciate any...
Hi Folks, My MonteCarlo model includes a d/dt term that I intend to simulate by calculating the difference between each successive result. For doing that, I...
Hi Folks, My MonteCarlo model includes a d/dt term that I intend to simulate by calculating the difference between each successive result. For doing that, I...
Hello Jairo, It's good to hear from you again in CBUG. If the quantity for which you are calculating the d/dt is anything other than a random walk, you will...
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