How is the sigma calculated?

Question

For some processes a data quality is already defined. What does this depend on? Partly even with a Sigma value partly not. Why is this the case and how is the sigma calculated?

Answer 1

Hi Yasemin,

e.g. in ecoinvent, this is described in the ecoinvent 3 method report; see also e.g. this article from a project I was happy to contribute (and lead, even), some years ago: https://www.readcube.com/articles/10.1007%2Fs11367-013-0670-5?author_access_token=uTKXu9RmwnEdzkABxkLVlPe4RwlQNchNByi7wbcMAY4hbIHqYus8MYapLCltH5PttD5ehLwKEQpkRxhQZ6pSR4TehyIiQnLpiOs1JTXIHUWh31FlDZO5MVoT85DSvQdx-f1nLZP3yNpa9T5NyDS0Cg==.

And the full report: https://www.greendelta.com/wp-content/uploads/2017/03/Pedigree_report_final_May2012.pdf

Best wishes, Andreas