Ventana software support forum

Thank you for the quick reply! I will give this a try.

Hi, I've been running lots of Powell calibrations and MCMC runs on a large health model in Vensim using a 16 core remote server, hoping this might help speed things up. But the calibration process is still prohibitively slow (around 5 simulations per second). On the system side, is there anything we...

Issue was resolved after working out some issues with my payoff definition. Now payoff is looking "normal" (a number close to the number of data points used for calibration). Powell calibration had good fit to the data and MCMC ran normally.

After writing this I have been playing around with the Powell optimization settings since I was concerned maybe our payoff wasn't appropriately weighted before taking the model into the MCMC optimizer. We previously were assuming normally distributed errors and coming up with weights from the standa...

Hello! Our team is running an MCMC optimization for the first time to produce credible intervals for our SD model. None of us are very familiar with this method, and we have some questions about things we are seeing. The SD model in question is a large health model that is being calibrated using 19 ...