13-07-2020, 08:03 PM
Hi Antti,
My stochastic runs are working as expected now - so thanks for your support on this. Just a couple of quick questions:
1. I can't get my stochastic runs to work with price elasticity at the moment. When I use a base price from a deterministic run, e.g. a Current Policies reference scenario, the model builds fine, but the GAMS solver fails to find a solution. It completes both the primal and the dual, but then gets stuck in a set of iterations that it doesn't break out from. I'm attaching a couple of screen shots from the terminal that might give some information on this issue, as well as my LST file, which doesn't seem to have any issues.
I'm wondering if you have any thoughts about why this might be occuring?
We've enabled elastic demand, but not for all demands, so some demands have COM_BPRICE/ELAST/VOC defined for them, and others don't. Could this be an issue when running in stochastic mode?
2. I've been using SW_LAMBDA to represent risk aversion. In the documentation, it says that this can range from 0 to inf. Does anyone have any literature to justify a range of lambda to explore within this? Even setting lambda to 1 makes a significant difference to my results, and I've seen some papers in the literature that suggest certain decision-makers have lambda <<1. If you have any suggestions around justifiable values of lambda to use, that would be really appreciated.
Thanks in advance,
Neil
My stochastic runs are working as expected now - so thanks for your support on this. Just a couple of quick questions:
1. I can't get my stochastic runs to work with price elasticity at the moment. When I use a base price from a deterministic run, e.g. a Current Policies reference scenario, the model builds fine, but the GAMS solver fails to find a solution. It completes both the primal and the dual, but then gets stuck in a set of iterations that it doesn't break out from. I'm attaching a couple of screen shots from the terminal that might give some information on this issue, as well as my LST file, which doesn't seem to have any issues.
I'm wondering if you have any thoughts about why this might be occuring?
We've enabled elastic demand, but not for all demands, so some demands have COM_BPRICE/ELAST/VOC defined for them, and others don't. Could this be an issue when running in stochastic mode?
2. I've been using SW_LAMBDA to represent risk aversion. In the documentation, it says that this can range from 0 to inf. Does anyone have any literature to justify a range of lambda to explore within this? Even setting lambda to 1 makes a significant difference to my results, and I've seen some papers in the literature that suggest certain decision-makers have lambda <<1. If you have any suggestions around justifiable values of lambda to use, that would be really appreciated.
Thanks in advance,
Neil