Monte Carlo Analysis

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s_mellino
Posts: 11
Joined: 25 Mar 2013 20:57

Monte Carlo Analysis

Post by s_mellino » 15 Jul 2013 14:54

Hi,

I'm trying to learn about the Monte Carlo Analysis in OpenLCA. As an example I used the Ecoinvent process, "corn, at farm (US)" and I performed the Monte Carlo Simulation with the CML 2001 method and 1000 iterations.
I have some questions:

a) The mean values are slightly different from the "normal" results (in SimaPro they are the same numbers), for example for GWP100 the "normal" results is 0.43 kg-CO2 eq whereas for the simulation is 0.38. Is it normal? Is it due to a different calculation method?

b) I received negative values as mean for the land use competition and resources depletion of abiotic resources. How it can be?

Thank you for your reply.

Regards

Salvatore Mellino

aciroth
Posts: 750
Joined: 09 May 2010 23:28

Re: Monte Carlo Analysis

Post by aciroth » 16 Jul 2013 17:20

Hi Salvatore,
You are right, this is indeed incorrect. We will fix this and upload a new version hopefully tomorrow.
Best,
Andreas

s_mellino
Posts: 11
Joined: 25 Mar 2013 20:57

Re: Monte Carlo Analysis

Post by s_mellino » 16 Jul 2013 18:15

Thanks Andreas,

I look forward for the new version!!!

Salvatore

LinzaItkonen
Posts: 14
Joined: 08 May 2013 13:09
Location: Helsinki, Finland

Re: Monte Carlo Analysis

Post by LinzaItkonen » 06 Aug 2013 11:44

I'm having the same trouble with the resource categories-- they're all negative even with no recycling.

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