Search found 27 matches
- 12 Jun 2017 11:25
- Forum: openLCA 1.6
- Topic: Monte Carlo Analysis
- Replies: 8
- Views: 8251
Re: Monte Carlo Analysis
Dear Andreas, Correct, I have already exported all the data and made the appropriate estimations of the log-transformed data. For me, I was just curious whether openLCA might include an option to automatically report log-transformed statistics, given that inventory data and thus results may commonly...
- 11 Jun 2017 09:58
- Forum: openLCA 1.6
- Topic: Monte Carlo Analysis
- Replies: 8
- Views: 8251
Re: Monte Carlo Analysis
Dear Andreas, Thanks for the reply. So, the final mean and standard deviation for each impact category are reported as arithmetic means and standard deviations, correct? This is problematic for skewed data, no? For instance, if the histogram of 10,000 MC outputs follows a log-normal best fit, it wou...
- 10 Jun 2017 12:47
- Forum: openLCA 1.6
- Topic: Monte Carlo Analysis
- Replies: 8
- Views: 8251
Re: Monte Carlo Analysis
Dear Andreas, My apologies, I didn't make clear my question. Defining the inventory distributions is clear for me. But I am wondering how openLCA calculates the mean and standard deviation for the resulting impacts (i.e. after the impacts are calculated for each Monte Carlo simulation, is the mean a...
- 09 Jun 2017 13:31
- Forum: openLCA 1.6
- Topic: Monte Carlo Analysis
- Replies: 8
- Views: 8251
Re: Monte Carlo Analysis
Hi Andreas, Thank you for the prompt reply and clarification. This is very good to know about the dependent sampling. Perhaps in the future, we can all look forward to an added feature with isolated sampling (e.g. foreground versus background sampling). One additional question, are the means and sta...
- 05 Jun 2017 15:17
- Forum: openLCA 1.6
- Topic: Monte Carlo Analysis
- Replies: 8
- Views: 8251
Monte Carlo Analysis
Dear Andreas, Michael, GreenDelta, Congratulations on the new version of openLCA 1.6 and also updating the Monte Carlo feature. I can now confirm that the negative results previously encountered with openLCA 1.3/1.4/1.5 are no longer there. I do have twp separate questions and they pertain to the sa...
- 15 Jun 2016 22:52
- Forum: Other
- Topic: Uncertainty and MC Results
- Replies: 1
- Views: 12132
Uncertainty and MC Results
Hello, Regarding the MC-results, I know that the results can be exported to Excel and that the uncertainty is shown per impact category and per elementary flow, however does openLCA allow for an uncertainty analysis per unit process (i.e. a global sensitivity analysis per certain unit processes of m...
- 05 Apr 2016 10:19
- Forum: Impact Assessment
- Topic: Monte Carlo analysis stopped
- Replies: 5
- Views: 7792
Re: Monte Carlo analysis stopped
Hi Andreas, Indeed, I have seen the slow MC-simulations on both 1.4 and 1.5 (as I recently installed and tested my datasets on the newest version just released). Have you and your team successfully ran MC-simulations yet running 1.5? (And, in general, I am noticing the same slower work-speeds in 1.5...
- 02 Apr 2016 11:46
- Forum: Impact Assessment
- Topic: Monte Carlo analysis stopped
- Replies: 5
- Views: 7792
Re: Monte Carlo analysis stopped
Hello, I am curious about the length of time it takes to run MC Simulations in openLCA. I tested a few trial-runs of 100 iterations and it was tremendously slow (1+hour), and now when I see that it took someone 10 days to reach 5000 iterations I am not certain I want to use openLCA for this. Is this...
- 22 May 2015 17:44
- Forum: openLCA 1.4
- Topic: Uncertainty (Contributional) Analysis
- Replies: 0
- Views: 6820
Uncertainty (Contributional) Analysis
Hi There, I was wondering if there is a way in openLCA to further analyse the uncertainty results, for example from Monte Carlo Simulations, such that the user can determine at what percentage a specific processes/flow contributes to the final result (the final impact category distribution). Best, M...
- 22 May 2015 15:43
- Forum: openLCA 1.4
- Topic: Economic Allocation in 1.4.1
- Replies: 0
- Views: 6694
Economic Allocation in 1.4.1
Hi There, I have a question regarding the calculation of the economic allocation factors. Let me first start with an example pulled directly from numbers I put into openLCA: Two outputs (both with flow property as "number of items"): Output A = 1 item, Output B = 5 items Economic Flow Properties: Ou...