+1 vote


I tried to run the Monte Carlo simulation and got this result:

Could anyone explain this to me? or how to fix this? 


** other graphs:

in openLCA by (150 points)
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1 Answer

+1 vote
by (22.6k points)
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Looking at your screenshot, it seems like you have not assigned any uncertainty values to the flows in the Inputs/Outputs list of the processes that belong to your product system. Some databases ship with pre-assigned uncertainty values, others do not. In the latter case you must assign values yourself. Just insert them in the column 'Uncertainty' of the Inputs/Outputs list of a process.


Update: You do not see any variation because your standard deviation is 1. If you enter e.g. 5 you will see variation during the MCS.
by (150 points)
Thanks for all your help. really appreciate it.