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(edit by me, Andreas Ciroth: Question was: why the heck don't I get an uncertainty distribution from my ecoinvent process in a Monte Carlo Simulation, I always get the same result) - after my reply - because LCI result processes do not have unertainty information - the user maybe thought this looks too embarassing and deleted the question.
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I don't know what you did but (of course) you get different results in the MCS:

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I don't know whether you are serious but the aggregated processes do not have any uncertainty (and even with uncertainty, a Monte Carlo simulation would be a bit pointless for a fully aggregated process). So: "Does it matter, which type of database i use? unit process versus aggregated?" - yes.
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