Wikipedia:CoRisk Index

The CoRisk Index is the first economic indicator of industry risk assessments related to COVID-19. In contrast to conventional economic climate indexes, such as the Ifo Business Climate Index or Purchasing Managers' Index, the CoRisk Index relies on automatically retrieved company filings. The index has been developed by a team of researchers led by Fabian Stephany at the Oxford Internet Institute, University of Oxford, and the Hertie School of Governance in March 2020. It gained international media attention    as an up-to-date empirical source for policy makers and researchers    investigating the economic repercussions of the Coronavirus Recession. The methodological approach of the index could be extended to measure company or industry risk assessments related to other economic shocks, such as the US-China trade wars.

Methodology
The index is calculated with the use of company 10-k risk reports filed to the U.S. Securities and Exchange Commission (SEC). The CoRisk Index is calculated industry-specific as a geometric mean of three measures:

$$CoRisk_t^i = \sqrt{Key_t^iSen_t^i}$$,

where $$Key_t^i$$ refers to the average industry count of Corona-related keywords in time used in each report and $$Sen_t^i$$ represents the text negativity in Corona-related sentences, for industry $$i$$ at time $$t$$.